well it's time to redo my tank I lost both my oscars the past 8 months 1 to dropsey 1 i guess to depression , bought a clown knife my jag eventually killed it I'm down to my jag(12") jack dempsey(6") and 14" pleco, it's just not doing it for me and am open to suggestions total redo, substrate will remain sand is my only requirement:help::help::help::help::help: