I cycled it for about a week without fish, took a water sample to a local store called aquatic environments, they tested it and said I could put some tetras in, so I put four in. They died within 24 hours, but I think it could've been because my kids were flipping the switch that shuts off the lights and it was also shutting off my filter and heater. I took a water sample in again about a week later and my ammonia was a little high, he said to wait a week so I did, tested the water again and ph, ammonia, and nitrites were all good! That was new years eve, and the platys I got are doing great so far. I don't know what kind of pleco, whatever would thrive best in my type of tank and with my platys I guess?