I would suggest you upgrade the return. I don't know what your drains can handle but you want to target 10x tank volume per hour through the Sump. With this target you get good aeration, good flow which will help with keeping the detritus suspended (as mentioned by Aquattro)
So you should be looking at 1700 gph return, after that you can check the need for additional flow from powerheads.
Wavysea's and Seaswirls are nice attachment for flow from the returns.
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75g 24x30x24 w/external overflow
35 sump/fuge
250w Ice Cap MH with Radium 20k & Luminarc Reflector
PS4 Return -PCI Chiller - WavySea
2 x Tunze 6101
H&S A150-2001
2 x Deltec Reactors Carbon/Phosban
Profilux Plus II
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