I would say noo way. Plecos can grow to be positively huge. All of the plecos I've owned have grown to be over 1 foot long, but I had them in a 55 gallon tank so that was okay. They also get more aggressive as the grow, so it may attack smaller fish. In a five gallon, you should only have on betta. You can also add a couple of shrimp in there, but only if it's a cycled tank. If you want to start a sorority it MUST BE AT LEAST 10 GALLONS, with AT LEAST 4 girls, and not over 7! I've also heard it's better to have an odd number. If you get a ten gallon, you can probably get some otos (but they like to school, so about 3 would be good), or cories (same as otos). Anything else would likely get too big, or too aggressive.