Such thing as too much water movement?

I have a 120G and between my return pump on a 1" SCWD and three Koralia 4's, I'm sitting at approximately 4700GPH flow in the tank. I have placed the Koralias so I shouldn't have any stagnant spots anywhere. For now the tank is going to be FOWLR until I'm certain I can keep levels balanced for corals. Would the amount of water movement I have be annoying or stressful to fish, or should it be fine? Also I thought about setting the Koralias on a timer to turn off at night to give the fish a rest, does that sound OK or not necessary? Thanks

 

That's about 40x tank turnover. Most SPS tanks run at a minimum of 50x turnover, and the fish have no problems. Most fish actually enjoy the high current, and will play in it. Depending on what type of corals you decide to do in the future that may be a little high though.

 

You dont' want dead spots, but you should have an area of lower flow to give the fish a rest if they want. If you have enough rock with holes and caves and such, then don't worry too much about them sleeping, they can usually find a place, although it may be a good idea to keep 1 or 2 power heads on a timer for the night.

 

sounds good. Fish love to play in the current.

 

yea I'd say you could possibly even add a little more current if you are gonna leave it FOWLR and there is plenty of rock for the fish to hide in. But if you decide you want to add some corals you could leave the current as is. I would leave 2 koralia's on for some sort of circulation at night though.

 

Thanks guys