I wanted to get one of those nice dwarf pleco's to put in my 75. Only a jag in there about 8 inches with a lot of drift wood and black gravel. I going to change to sand and I wanted to order a dwarf pleco from the lfs. btw would it be okay to use marine sand in my 75. The p.h is already high in there, 7.8 even with all the drift wood in there. reason being isvbecause all my lfs only have marine sand. i dont want to use home depot or pool filter sand. I like the light color of sand. They used to carry estes sand but they havent had it in a while.