Well i guess it wouldn't take up much room. Im assuming its a regular 75g. meaning 18 inch deep, wouldnt be bad at all.i made a DIY cement background. I didnt use PVC though. Are you using the PVC for holes the fish can hide or something? I have a jack dempsey around 7 inches maybe bigger that fits in a 4-5inch pvc pipe. But i feel as though that would take up a lot in a 75 if you are running it across the whole back.
Yes the holes will be for the BN pleco and/ or any other fish to hide in.i made a DIY cement background. I didnt use PVC though. Are you using the PVC for holes the fish can hide or something? I have a jack dempsey around 7 inches maybe bigger that fits in a 4-5inch pvc pipe. But i feel as though that would take up a lot in a 75 if you are running it across the whole back.