40 times volume flow?

[Proteus]

Y do you want 4x flow.

18 fish in a 55. Wow

Fire fish are jumpers. Just so you know.

[kien]

Originally Posted by Titus99

Y do you want 4x flow.

18 fish in a 55. Wow

19. You forgot the "shrimp/goby"

[intarsiabox]

That's a lot of flow for the corals on your list. 20x would be better IMO. It doesn't have to be continuous direct flow either, alternating and faster/slower speed rates are more natural. Getting the flow to cover all the nooks and crannies of the tank is more important than actual flow rates. It helps keep algae and cyno at bay and is good for nutrient export to feed the corals and keep things in suspension for waste removal.

[gregzz4]

Besides it being mentioned that's too many fish for your tank

6.1x your total system volume is enough for flow through your sump for most skimmers to work correctly

The 35-40x flow is total/combined flow in your tank for the highest flow requirements of some SPS. This includes your return pump ( 6.1x sump flow ) + your intank stuff ( powerheads/closed loops/wave boxes )

You don't need such a high flow rate if you're not keeping only the most finicky SPS, and such a flow will probably destroy lots of LPS

Depending on what you plan on keeping, you can get away with much lower flow rates such as 20-25x total turnover

So, for your 55g tank as an example with a 15g sump ( total probably close to 60g ), your return pump would work well with 350-400gph
Your total system volume in my model is 60g, so 25x is 1500gph-400=1100
Divide that by 2 and you only need 2 powerheads of 5-600gph each

Of course, this is just a gestimate, and having multiple powerheads in a system is better than 2, in most cases ...

[SoloSK71]

Originally Posted by Titus99

Y do you want 4x flow.

18 fish in a 55. Wow

Fire fish are jumpers. Just so you know.

I don't 'want' 40x flow, I want to make sure I can use 10x but it seems that it too low according to most web sites.

18 fish that are going to stay at 1" in length and get sold/traded when they get bigger.

Charles

[Proteus]

It's your decision. But IMO. 5 damsels are going to create a fair amount of aggression. I had two in a 180 and they were not a friendly fish. Also hate to see a ha breakout from such a high bio load.

But back on topic.

[SoloSK71]

Originally Posted by Titus99

It's your decision. But IMO. 5 damsels are going to create a fair amount of aggression. I had two in a 180 and they were not a friendly fish. Also hate to see a ha breakout from such a high bio load.

But back on topic.

Looking at it now you might be right on that. I think I will not order the damsels, even thought they are listed as peaceful. Got a sea hare in there for the hair algae.

Charles

[gregzz4]

Originally Posted by SoloSK71

Got a sea hare in there for the hair algae.

Charles

Not to put a damper on your wish list, but don't count on your sea hare to keep HA under control
Better off not overstocking to begin with

I'm trying my best to stick with the rule of 4" of fish per 10g of habitable water, but it's hard to do in a 75g, especially when most of the fish I want are 4+ inches each

[albert_dao]

WTH guys, 40x flow is like the MINIMUM.

I have like 90x flow and I just keep zoas and LPS -____-

Anyway, just don't be a dummy and put animals in front of the muzzle of your powerhead. Problem solved.

[gregzz4]

Originally Posted by albert_dao

WTH guys, 40x flow is like the MINIMUM.

I have like 90x flow and I just keep zoas and LPS -____-

Anyway, just don't be a dummy and put animals in front of the muzzle of your powerhead. Problem solved.

I think 'muzzle' is the keyword here

And Albert, we're talkin' reef tanks here, not your lap pool