Having issues with detritus sitting on the left side of my tank. I run a Nero 5 on the left side of wall at 50% also it’s the same area where my overflow is so may not be enough pull from my return pump but does drain quiet well. Or my Nero five is just blowing it away from the drain part Other side of the tank right side wall running a smaller jaebo pump at 100% and isn’t seem to be doing much. Both are up top about 4-5 inches from water surface. Do corner over flow tanks have this issue with dead spots ? Do I need powerheads on back wall where my return nozzle is ? Photo for example. Older photo