I have 90 Gal tank that Im converting from salt to fresh but been a few years since Ive messed with fresh. im looking at keeping a Pleco, some Knifefish, Neddle Nose Gar, possibly an arowana. I have live sand in there that i have "killed" and rinsed out very thourghly, aslo want to put driftwood and some rocks. does this sound alright? thanks.