How many of these little bastards can I keep in a 29g aquarium. Tank set up is as follows, 29g 30" x 12.5" x 18", Eheim 2213 canister filter, Maxi-Jet 600 Powerhead, Marineland Stealth Heater "newer LED display model", Flourite black sand substrate and some driftwood. I was thinking 12 of them and they would be the only fish in the tank, what do you guys think? any input is appreciated. A lot of places say they need to be crowded together, while others say the exact opposite. I will most likely base my final decision on the trusted opinions of MFK.