Have my scrubber running for a couple days now. Its on a 155g with 60g sump. I have it fed off my overflow drains with one 23w cfl on each one. Since I have 2 overflows I split the scrubber into two screens each sized at 10x10 or so. I am receiving a decent amount of gurgling/bubbling where the water comes out of the slot. Does this mean my pressure is too high/low? How would I go about reducing it? I played around with the slot length by shortening it, didn't help much got worse. I tried lengthening it but due to not changing the screen size, on either side of the screen there is water that falls directly to the sump(I know this is contributing quite a bit). This is all on a new tank that is currently cycling. If my sizing and light requirements are not correct, what would be? I will be switching to the UFO led grow lights they sell on ebay.