Hang on back. Sorry I didn't know that at first either. Always have a gravel vac of some sort. Think about investing in a python or a similar brand. Hook it right up to your faucet and it does the water change for you, that is if your water is ok. But the fish you have aren't demanding in terms of water hardness and ph, so I don't think that would be a problem. Clown plecos...I see 3-4 in. on most websites. Clown loaches on the other hand can get to a foot and even bigger plus require a group of them. Definitely not for your size tank...don't always trust books, some are outdated and others just stink.