I have had a 10 gallon tank running for about 2 weeks and i am thinking about getting a pair of guppies in it. the tank currently has a regent 5-15 power filter and i have been meaning to get a bio wheel. the tank has a pump and i don't think i need a heater because my house stays in the mid/low 70s anyway. i just need to know what other fish i can keep with my guppies and any other info you may have.