550 pond gold fish
55 for the fish in the pond
30 cichlids
15 salt demselfish
10 neon tetras, platies
2.5 baby sitting lol thats what you tell your father wen you dont want to get rid of a tank
Depends on your utility costs. Water is really cheap here, but electricity is moderately expensive. It saved me a noticeable amount of money each month changing to sponge filters, smaller/no lights, and smaller heaters when I had a lot of tanks running.
I now have 2-100 gallon display tanks 5-75 gallon breeding tanks, 1-55 gallon grow out tank, 9-20 gallon fry tanks. I do water changes weekly and it takes too much time
I also have 2-125 gallon tanks but they aren't full of anything but water at the moment awaiting setup. And I have another 12-20 gallons empty and 3-30 gallons and 3-20 gallon breeders(same foot print as 30 gallon) those will go up when I have time.