Hello. What I use for figuring out fish size vs water volume is 3 gallons for every inch of fish. Of course I wouldn't put a baby one inch fish in a 3 gallon bowl, my smallest tank is a 15 gallon. But anyways does 3 gallons per inch of fish sound right. For example, four 5 inch fish in a 60 gallon.

If u can adhere to those rules (providing you wouldn't go less than 10 gallons for smallest tank), then it's wonderful. Still gotta provide around 10x filtration though.

Cool Cool, All the pet stores around here tell me that it should be 1 gallon per inch of fish and after reading discussions on here I just can't see how that would be correct. 60 inches of fish in a 60 gallon, thats a lot of fish.

lots of pet shops assume the gallon-to-fish rule is the same for tropicals and goldies, which is why people end up with tanks too small for their goldfish

Also keep in mind that you want to use the inch rule for the ADULT size of the fish. So for example, a fancy may grow to become anywhere between 8 to 10 inches. So if you were to use the 2-3 gallons per inch of fish rule here, you should keep about 16-30 gallons per goldfish.

For simplicity, we go with 10 gallons per fancy goldfish and 20 gallons per common goldfish.

I have 4X 3.5 inch shubunkins tail included if you supposed to include it, 2X inch fantails, 1X inch black more and a 2.5-3 inch pearlscale. I have a 15 gallons tall hex tank. A 20 gallon tall and a 25 gallon long. Where do you think I should put them all for now. All my tanks have bare bottoms and few ornaments.