How much flow is to much flow

[Vanderturks]

I have a 125gallon FOWLER tank. There is a wet dry drip filter and a eheim 2215 canister filter. I some small power heads on it there are old and don't do much. I had some dead spots in the corners of my tank when I would vaccume the sand bottom the water would be black so I got a aquatop cps-24 and cps-12 for it they have been going for about a month now. I noticed a big increase in the amount of filter feeding hitchhikers on my live rock and started growing some anemones on accident. This morning I found my blue spotted puffer stuck to one of the circulation pumps dead. I was gifted this fish from a friend that gave the hobby up. I am wondering do I have too much circulation/flow is it harming my fish? I have only had a salt water tank for about two years.
Tank specs
60inch L
26 inch H
18.5 inch w
45-60lb live rock mixed kinds
40-60lb live sand
1-spotted leopard grouper
1-prcupine puffer
1- green bird wrass
1- black white stripe convict damsiel
1-tomato clown
1-fox face

Do I have to much flow?suggestions besides get rid of the bird wrass and grouper

 

[mcgyvr]

3100gph + 1300gph = 4400gph / 125gallon = 35x turnover rate not including canister filter is just fine and would be in the "low/medium" flow..
Some run 75 too 100x display volume (heavy flow sps tanks,etc..)

On average 30-50x is a good starting point and certainly not too much flow..

 

[kmbyrnes]

Depending on the fish or corals natural habitat, they may prefer more or less flow but in general, more flow is better.

 

[Blackdog2]

I suspect the fish died first and then stuck to the pump