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Discussion Starter · #1 ·
I'm interested in purchasing a hydor koralia water circulation pump but am not sure how many GPH I want. The tank is a bowfront that is 48" x 18" (at center) and 14" (on either side) x 26"

I do not want it to be so powerful as to bother my fish (malawi haps and peacocks and a few julies), but I also want to maximize its ability to provide good surface agitation and push some of the poop from off the substrate and up toward the overflow box. At the moment the overflow box does not remove almost anything that is not on top of the water. I know this will not replace gravel vacuuming, but I want it to keep the bottom cleaner.

Also, they look difficult to hide and I'm wondering if anyone had thoughts on where to put them. If I placed it in the back top left corner (the overflow is in the back top right corner) then it probably would be hidden under the canopy, but could it create a strong enough flow to push the poop settled on the substrate to the overflow without being too strong to bother the fish?

I saw the suggestion about using a timer so it is off at night so the fish can sleep without it bothering them and think it is an excellent idea which I plan to use.
 

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Discussion Starter · #5 ·
i actually have no concept as to how powerful any of these are. do you use one of those in your tank?
 

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Discussion Starter · #7 ·
so i take it that means your 1 in a 75G doesn't even come close to pushing poop toward the tank, let alone push the fish around?
 

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Discussion Starter · #8 ·
UPDATE: i just bought a hydor 3. for my 4 foot 95G tank this is waaay too strong. kept it on for a few minutes but fish remained all bunched up on opposite side of the tank.

i think i will try a 1.
 

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I have a 3 on one side, and a 2 on the other side of my 125 gallon... lots of circulation, and my fish seem happy with it... I feed them just above the 3. The suction of the water pulls the pellets down and right on through, making like a snowstorm of food... The food gets spread over the whole tank in no time. They then go at it like a bunch of nutcases... very cool to see :)

Second, I have a 2080 and a C-360 as well, so that too is making some more current. I have a total of 2900 + 5500 liter per hour of water movement :D
 

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btw, don't think a 1 will do your tank any favour... I can see a very clear difference between the 2 and the 3, and if I had the chance, I'd return the 2 and get a second 3.
 

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Discussion Starter · #11 ·
i repositioned the hydor and it works quite well now in that the fish don't seem to mind it. so I agree, a 3 is good, and probably better that i bought this instead of a 1 or 2.

however, am i positioning the hydor incorrectly? the goal of purchasing this was to push debris into the overflow box. the overflow box is located in the back right corner of the tank. (for more info click the my tank button).

where should i place the hydor?
i have tried just about every angle in every part of the tank. i had hoped this would work instead of UGJ but it doesnt seem to be doing that.
OR
am i wrong and the hydor just helps with water movement?

the fundamental problem appears to be that the hydor so strongly sucks the water around it that any debris which it does a good job of pushing away just swirls around and ends up getting sucked right back in and shot out again.
 

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The idea is to make the path to the overflow as long as possible, so back left corner is probably the most practical. You can also submerge the Hydor deeper to create more back-pressure. And aim the flow against the left side of the tank, which will displace more water down, also helping to sweep the bottom of the tank.
I would much rather have a larger powerhead than necessary, especially in a bigger tank.
 

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Discussion Starter · #13 ·
are you saying place the hydor on the left wall and point it toward the overflow? i tried that but since the return is on the overflow and it pushes water into the tank from right to left having the hydor on the left and pointing it toward the overflow seems to cause a whirlwind of sorts which the fish don't appreciate.

also, should the hydor be angled upward or downward?
 

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NO i am using your description of left (the side opposite the overflow), to create counter-clockwise flow. Submerge it and alter the angle UP, play the with the combo until you get the flow you need.
 

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Discussion Starter · #15 ·
i realize you're using my description. i was trying to understand if i had already done what you suggested and if so, explaining why it didn't seem to work.

in any event, it sounds like regardless of where exactly it ought to be placed, you believe that it ought to be aimed UP and not down right? (that obviously is, at least intuitively, more logical. it's just much harder to find a spot to put it that doesnt make it and the wire stand out like a sore thumb).
 

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Hey,

I picked up a Koralia 1, 2, and 4 a few months back. The 1 is in my 25 gallon salt tank and moves more than enough water, the 2 is in my 45 gallon fresh tank, and does fine, and I tried putting the 4 in my 70-ish gallon tank with an Oscar and a pleco. Pushed the 8'' Oscar around the tank. It's unplugged now and waiting for the 150 gallon to get set up. Hope that gives you some idea...

Luke
 

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Discussion Starter · #18 ·
thanks. i currently have the 3 and in some positions it works well in my tank.

my current problem (as i mention in previous few posts) is that I don't know where to put it to ensure most of the debris goes to the overflow instead of to the ground.
 

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Discussion Starter · #19 ·
Just updating this thread. I've had the Hydor 3 on the tank for over six months now and it is positioned right next to the overflow. The overflow is in the right corner and the hydor points away from the overflow. Save for the far left end of the tank virtually all the debris is removed from the ground with this one hydor and the fish love to swim against its current.

In short, it's been outstanding.

Took some time to figure out just where I ought to put it, but once I got that down water changes are now as simple as sticking the python in and letting it drain. The hydor combined with the sand means 30 seconds of python cleaning in the left corner is all I need. I don't know if the hydor 4 would have been too strong for the fish, but I'm sure it would have meant nothing to clean at all in the tank.
 
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