Hydor Korilia 425's on 40 B

[woodya]

I know that you want 12 gph and up for salt tanks. I have a 40 B and bought two 800 gph and it's way too much! So I was wondering would two Hydor 425s be right or too much? I am going to have a reef tank with fish and coral most likely not SP's. Thoughts? Thanks!

 

[Soundwave]

Two 425s will not be enough. The two 800s sounds better. Personally, I have my return pump pushing around 300gph, a tunze 6015 modded for wide flow and an MP10 set to reef crest at full blast.

Mine would be in the moderate flow category.

FWIW, I have a Koralia 425 on my 5g frag tank. In that scenario, it's enough power.

 

[woodya]

Isn't two 800's like 40 cycles? My clown fish turn really white and looked like he was gonna die after a little with them on.

 

[cerolost]

I had 2 koralia nano 425 on a 20g long and not enough. tunze 6015 is awesome and i have yet to mod it

 

[woodya]

What kind of a tank are you keeping? I don't want to kill my fish or them not be able to swim around.

 

[Soundwave]

I have a 40b as well. If your fish turned white, you may have another problem. Fish can deal with flow. They may need a little time but they will adapt. Pour some food (mysis) in the tank with all the pumps going. If any of it settles on the sand bed, you need more flow.

 

[woodya]

Sound wave what's your total gph?

 

[Soundwave]

That's kinda variable. With the vortech at full speed, which isn't constant, I'm sitting around the 2400gph mark.

That puts me a 60x turnover, I guess.

With all the wide flow, It makes things calmer than what you would imagine. Sand does move, though.

 

[thao0209]

I have two evo 1400 on my 40BR and i still think it's not enough. once you start putting rocks in there you will notice that you need more flow.

 

[woodya]

I have more than 40 lbs of rocks in there my clown fish just look like they can't go anywhere and my tank currently is fowlr. Isn't 40 turnover really high for fowlr?

 

[Fitz19d]

You could do one 800gph and then a smaller one if you are that sure that it's overkill.

With no corals/nems in there? Yeah might not matter if you run a bit lower though flow is still good for stirring up and keeping crap suspended to go into sump/filters.

 

[MrIcky]

If it's fowlr you probably don't need quite that much, but koralias and other prop type pumps have such a dispersed flow that having >20x flow isn't going to upset the fish.

 

[woodya]

I am planning on adding softies and LPs but not SPs or hard. If I downgraded to two 425s would it be enough?

 

[MrIcky]

If you are going to have corals, just keep the bigger pumps. Angle them toward the surface or a wall or something if it's really bugging your fish. Personally I have a 65 gallon (so the same foot print, just taller) and I'm running about 3600 peak gph turn over and the fish are fine. I feed where the strongest current in the tank is and they happily swim right into it.