Ok...I'm already thinking about changing up my setup. I want to replace the crushed coral with sand. Is it harmful to do this with fish still in the tank? i also want to ATTEMPT pvc aquascaping for better flow and appearance. Any advise? what are your thoughts on sealing the pvc ends to keep crud from building up in them? Im thinking about using pvc as legs to support plastic grid to hold rock up off the sand. What is the best way to hide pvc? epoxy some rock on it? oh yeah....and my wife is just shaking her head at me for already wanting to change up. LOL!