I have a 55 g and 29 g FW. I have had a FW tank constantly from the time I was 18 back in 1986. Yeah that was Charles Atlas in the pic
. I still have two show Jack Dempseys, which I still can't figure out why they quit spawning. They were prolific for 3 years, then quit. I am also selectively breeding guppies. I try to cull them constantly, but have probably 400-500 in the 55 g tank. I am slowly shutting tanks down as I work on building my new house. I will be 100% off grid and want to have as small an electric use as possible when I move in. Before that I had 11 tanks 10 g-125 g mixed FW/SW and 1-10 g brackish.