Theres an odd flow in my tank thats causing one corner of the tank to push sand inward, exposing the bottom of the tank. There is absolutely NO direct flow on this area. I have 1 PH on each side of the tank pointed at each other and upwards to break the surface. The bare spot is opposite of the stronger powerhead, about 4' away. The only thing I can think of is that the stronger PH is hitting the glass and reflecting inward. If i move the sand back over the bare spot, it's bare again in a day or two. I've tried redirecting it but then i just get a bare spot somewhere else. I tried place a rock against the wall to help diffuse the flow which helped a little bit...
I have a 48" long 75g tank with a 1350gph and 720gph maxis. The lfs
suggested this as a minimum, but its starting to look like they're too strong. Do I just need more LR
? I have about 60lbs so far. Any other suggestions?