it was an established tank when i got it 2 or 3 weeks ago, half the water was taken out before transfering tank to my house filled it back up and added dechlorinator and anmonia out, it only had a algea eater and 30 some odd guppies, got rid of most of the guppies have 5 in there and got the 2 molies and 3 ghost shrimp getting a good filter system with heater wednesday when hubby gets paid temp has remaind a constant 79*