I started out having some cute little goldfish catch my eye YEARS ago. I bought 3 or 4.....why not I had a 10 gallon tank at home that hadn't been used in years. I took them home, filled the tank, plunked the fish in there & then went to find where I had stored the filter. You can imagine it didn't take long for things to go TERRIBLY wrong. The poor lil' goldies started swimming less & less....then started dying. I started searching the web & stumbled across KOKO's. I quickly found I had not near enough tank & way too many fish! MY hubby bought me a 20 gallon tank. I think one goldie survived the ordeal. My learning curve was long & slow but I eventually learned & can now enjoy them!!