Yep, totally using a 50 gallon fish tank for my brooder. Had a cold snap and lost nearly half my chicks. Brought them into my pet room so I can observe them better. The tank is sitting on my desk so they can see me too. I used the top to an old bird cage to hold up two heat lamps. The top fits perfectly across the top of the tank to provide a better surface for the clamps. One heat lamp is the usual lamp with a red bulb. The other is a smaller lamp with a nighttime purple reptile bulb. The tank is so long that I wanted to make sure they had plenty of heat at different intensities.