So I got a wild hair today and started converting my 55 gal. to sand! I bought a thing of playground sand from lowes and rinsed i t for like 45min....(man that stunk) but I have a little over half the tank done and will leave it for a week or so....I took out 1/4 of the gravel and then piled the rest to one side... Now my peacock eel is not very happy about living in sand though so should I leave a bit of the gravel for him??? (its large polished stones not really gravel..)