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Old 11-15-2010, 01:08 PM   #1 (permalink)
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Thumbs up Hydor Koralia Magnum 7 & 8 :: REVIEW

I recently purchased a set of new Koralias; Magnum 7 & Magnum 8 to be specific and let me tell you, I AM blown away and so are the fish, literally.

The idea was to replace some of the Koralia 4s (see review here) I've had in this tank for over 3 years now (nothing wrong with these, just upgrading). I also wanted to create stronger flow pattern across the top/back of the tank. I also wanted to see if I was able to get rid of the 2 SEIOs I have in the back of the tank.

Upon installation of the Magnum 8, I removed 2 Koralia 4s and disconnected the SEIOs. I plugged in the M8 and holly smokes this think was moving water. My tank became somewhat cloudy from all the crap that got blown out of the live rock and crevices around the tank. My softies growing in the upper part of the tank closed up because the flow was just enormous. The surface agitation was like I have never seen before. The current created was just ripping through the water and it was easy to see the flow pattern just watching all the particles circulating around the tank.

Anyway, 30 minutes after installing it my softies re-opened as to see what's new. I was a bit nervous to leave it overnight not knowing how the rest of the tank would acclimate to this strong current so I swapped the M8 (3250 GPH) with M7 (2800 GPH) and it has been in the tank ever since. I might keep the M8 on the other side of the tank or exchange it for another 7 or even 6.

These things are powerful and yet come in a small package. While these powerheads are bulkier (fatter) they are actually shorter than my Koralia 4s and so appear to take up less space (and it did indeed). One Magnum 7 replaced 2 Koralia 4s and 2 SEIO 620s. Not only did I remove a lot of equipment from the tank for more eye-pleasing look I will also save money on electricity.

Each Koralia 4 is rated at 1200 GPH @ 12 Watts and the SEIO 620s are rated 620 GPH @ 8W. Do the math and you'll see that it adds to 40W or just about 1kW every 24 hours. As already mentioned, the Magnum 7 is rated 2800 GPH @ 12 Watts which translates to 70% in savings.

I would strongly recommend these pumps but only to people with large tanks. The magnum 7 belongs to a 125G+, 6ft long tanks and the Magnum 8 belongs to 180G+ setup.

Time will tell how long these will last but judging by the worry-free operation of other Koralias one should expect years of maintenance free service. I should also mention that the design of the impeller has changed. It is now only attached at the bottom in contrast to shafts that attach on both ends. This is supposed to improve their reliability and cut back on the clicking noise if used on a wave maker/time type device.
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Old 04-28-2012, 10:28 AM   #2 (permalink)
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They definitely are awesome pumps, but they're not suitable for wavemaker use IMO (on the apex anyway, maybe not on a koralia wavemaker?)

Also the Magnum 8's are absolutely, positively too much for my 150XH, but that's not my problem with them.

They do output a tremendous amount of flow - the problem is that the flow is somewhat narrow out of the gate, but winds up in a tremendous swell at the end of its range (which, best I can tell is easily 4 feet and probably more!) Make no mistake, this is an AWESOME amount of flow for a $100ish pump. I completely concur with puffer - these pumps REQUIRE a long tank.

I have 2 problems with this pump, and they're both related to each other. If it EVER for ANY reason gets pointed down at your sand, expect a huge bald spot and lots of sand in your sump (it happened to me!) If you have a large tank and are not using the apex as a wavemaker, these pumps are amazing.

The reason I say they're bad with the Apex's built in wavemaker controls is that these pumps do some kind of realignment when they start up. Usually it's in the form of a few clicks and jolts once power is applied. (Note: I tested this with both the solid state switch ports and the two mechanically switched ports on the EB8.)

The Magnum 8's require quite a bit of power to stick to your glass - so they use both magnets *and* suction cups. But even then, the jolting startup motion often knocks them ever so slightly off their current alignment point, eventually causing the problem I ran into - it wound up pointing into the sand and making a nice fat bald spot with loads of sand in my sump

Even with these pumps placed low, high, and aimed upwards, whatever - in my 150 they made lots of different (and interesting) patterns in my sand The surface tension was astounding. In some ways it was sad to have to remove them.
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Old 04-30-2012, 02:29 PM   #3 (permalink)
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Great pumps, have the Magnums 8 and the 7, mind you both one one side along with K4 on the same side of the tank, opposing side has two K4s and 1/2 return from sump.

You're absolutely right about massive swells in the middle of the tank. Doesn't bother anything I have so they are in. I haven't cleaned them since I got them nearly 2 years ago and they have never stopped working. They also always restart although with a bith of click to it but they always do. They are not made for wavemaker I believe, the 12V version of Koralias are.

I haven't experience the same problem you've run into where they actually move, mine are pretty stiff to adjust, I sort of haven't touch them in nearly 2 years, except for when my son took off the magnets on the outside

Needless to say, they are like hookers; you get a mega-blow for little money. Pump is cheap to obtain and cheap to run. In 6 months or so they'll go through a vinegar bath as they are somewhat due for exterior cleaning; my recent addition of urchins just prolonged the process

Here is the process Cleaning Pumps & Powerheads : Koralias, Vortex, Seio, etc.,

I can't recommend them enough, would without hesitation buy again.
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Old 04-30-2012, 06:08 PM   #4 (permalink)
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Well, maybe *NEWARK* hookers
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Old 12-19-2012, 02:03 PM   #5 (permalink)
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Hehe, I found this page through google searching for a magnum 7 or 8 in stock.

These things are OUT OF STOCK everywhere!!!

I checked like 20 different stores and nobody has them. It's been like this since Thanksgiving when I picked up a Magnum 7 because the retailer didnt have the 8 in stock.

Today i've been searching again and whoever has them listed and I call I hear the same thing "Sorry, we don't have them in stock"

Anyhow, long story short, it's been over 2 years since I initially installed them and I absolutely love them in my 180. Now that I added a Hydor SmartWave controller where they alternate I decided to add another 7 and 8 to the other side of the tank.

Why is it that whenever you finally want to buy something everything is out of stock????
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Old 12-19-2012, 02:20 PM   #6 (permalink)
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BTW I wrote to Hydor asking about NO STOCK anywhere. Let's see if they reply.

Too early to speculate but talking to different retailers it appears to be supply problem as in Hydor not being able to obtain enough stock rather than a sign of new product going to be introduced soon.
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Old 12-24-2012, 10:22 AM   #7 (permalink)
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NO reply from Hydor, a bit surprised given their stellar product support.

Anyhow, found a Magnum 7 in stock at Aquatic Eco Systems in FL, should be on the way right after holidays.

Hmmmmm, maybe a new killer product is going to be announced soon.....something that plugs right into the APEX would be nice.
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Old 12-27-2012, 09:17 AM   #8 (permalink)
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check with Exotic Aquariums (305) 266-0978 their address is 7399 Bird Road, Miami, FL 33155 and this is their web site Exotic Aquariums - The Finest Quality Aquarium Livestock and Supply in Miami hope that helps Puffer
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Old 12-30-2012, 12:11 PM   #9 (permalink)
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Thanks!

I got an order with Aquatic ECO Systems and it's scheduled to ship after new years. If they find out they dont have any stock upon return from vacation I will try your recommendation.
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Old 01-03-2013, 02:03 PM   #10 (permalink)
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The 7 came in today via Fedex. It's as they call NEW old stock. You can tell by the label on the unit that Aquatic Eco-Systems probably has a huge stock as the label clearly says Koralia 7 vs the newer ones while identical actually say Koralia 2700. (which actually indicated GPH output)

Well now that I have 4 in total and 2 separate Smart Wave controllers i'll be able to get a pretty random current patterns. I can set one side to alternate say every minute and the other to alternate every 30 seconds or do a swell every 30 secons. I'll see how my softies respond to over 11000 GPH from 4 powerheads and return pump

I'll use 1 Koralia Magnum 8 (3250), 2 KM7s (2700GPH) and 1 KM6 (2200GPH)
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