how many gph for 75 gallon tank

[slickace17]

I have a 75 gallon tank I just started a mont ago I have a 400 marine land maxi jet gph power head set in laminar flow now but I was told it wasn't powerful enough so I ordered a 1600 gph power head and wave maker is this too much for my tank an what is the best way to position it. Also should I turn my 400 into power head mode and keep it in tank

[undertai]

If you doing a reef tank, most suggest 5x to 10x the size of your tank for flow. If your doing fish only 2x to 5x the size of your tank.

[gbru316]

I have over 1600 gph in my 20 gallon tank that is predominantly soft corals and LPS. I'd suggest no less than 2500 gph(preferably more) provided it is of the low-velocity type.

Corals require water movement to bring them food and to carry away waste. While we'll never be able to match the flow rates on a coral reef, that shouldn't stop us from trying. The key, though, is to keep the velocity low. If the velocity is too high, it can rip tissue right off of some corals.

Higher flow rates will also keep detritus suspended so that it can be filtered out.

[slickace17]

Thanks guys

[garyinco]

Wow. 2500 gph on a 75 gallon tank. That sounds like a lot to me. I have 900gph on a 100 gal tank and it seems more than enough to me. I have a pretty non restrictive plumbing setup.

[mcgyvr]

IMO.. 10X to 100X
I run about 30X

[Siebo]

I turn over about 2500gph in my 65g with the PH's. The return does not count IMO as I just match flow to my skimmer.

[garyinco]

Flow inside the DT is one thing (I have two MP40s and a couple of the Jebao RW8's in the tank) and flow thru the sump is another (figure mine is 7-8 times per hour).

[gbru316]

Originally Posted by garyinco

2500 gph on a 75 gallon tank. That sounds like a lot to me. I have 900gph on a 100 gal tank and it seems more than enough to me.

It's not. Ecotech recommends 1600 to 2600 gph for a 75 gallon tank.

Flow calculator


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I highly suggest increasing your flow rate. 900 in a 75 is not sufficient unless it's a FOWLR. Respiration and photosynthesis of coral is directly related to the amount of water movement surrounding it. You want as much flow as you can get without negatively affecting your coral. Not only will more flow help your coral grow, it'll keep it healthier too since coral in low flow environments are more susceptible to photoinhibition and bleaching. Flow even determines the growth pattern of coral, much like light (or the lack thereof) does.

Anecdotal, but quite a few tanks of the month have roughly 45x turnover in their display.

[garyinco]

When I said "sounds like a lot" I'm talking about turnover thru the sump, not circulation flow inside the tank.

With two MP40s and two RW8's, plus the flow from the return I'm over the 2600 mark for sure.

[slickace17]

Thanx guys I have my 1600 GPU Image wave circulator and powerehead on the way I may make my maxi jet into the air power head mode