I have a 55 gallon tank and also a 20 High tank. Before I bought my first set-up and before I even thought about going to the fish store, I researched as much as possible on the internet to learn about water chemistry, suitable tankmates, and all necessary care. I am so glad that I did. I never had a fatality due to overcrowding or the initial nitrogen cycling of the tank. I ended up keeping very easy fish my first year, which made the fishkeeping experience a joy as a beginner. I kept all platy fish because in my area, my water is ideal for them (and also for cichlids, although I am not interested in cichlids at this point). My most recent acquisitions were 3 goldfish, a pleco and a little african dwarf frog. They were fish that I rescued when my downstairs neighbor moved and abandoned a tiny, dirty fish tank out on his balcony.
I was so glad that I didn't overstock my 20H tank because at the time the rescue fish needed emergency intervention, I felt it was OK to save them because I "only have a few fish". But I didn't put them in to my tank at first. Initially, I set up the rescue fish in large plastic storage boxes (clear plastic boxes because I was told colored plastic may be toxic, and clear is most likely the safest). I was afraid the new fish would have a disease and kill my current fish so I wanted to quarantine for a month at least. I am so glad that I did that because I ended up having time to buy a big, new tank for them anyhow. I needed a 55 glallon tank because I realized the pleco could grow to over a foot in length. (I may have to upgrade to a 75 or 100 gallon at some point!) Getting the new tank was a good decision because a little later, the rescue goldfish all started showing signs of disease. To this day, I'm not sure if they only had a bacterial infection or if they carried the dreaded fish pox. I only have one goldfish who survived plus the pleco. The african dwarf frog seems to have died of old age.
At this time, I would love to find another rescue fantail goldfish. I need a female who is at least half as large as my big fantail boy. He's so lonely. He used to love following around the 2 females before they died. Now he's a pathetic sight because he constantly follows the pleco who would rather be alone. But they both associate each other with getting food, so they do tend to go to each other when they are begging at the glass for food. I never would have believed it but the pleco also has quite a personality. He watches me thorugh the glass and when he's begging, he bobbs his head at the glass in circular motions. He's not sucking the glass. When he begs, he doesn't even put his suckermouth on the glass, so it's obvious he's trying to get my attention (and not just cleaning the glass).
I'm not sure what I will end up doing though. I realize that my pleco may turn aggressive at some later stage. I heard that when they get older (and go through a hormonal stage), they can attack any "gentle" fish in the tank, such as goldfish. So I may have to put my goldie in a 20 or 30 gallon (and he's going to be in for a shock when that happens!), and then I may actually put an advertisement in the local paper that I can take someone's oscar if they don't want him anymore. To my understanding, the best fish to keep with a pleco is an oscar. Not that I want an oscar but I don't mind. I think they are ugly but they have good personalities from what I hear. I like the idea of giving an animal a home when otherwise it might die of neglect or be abandoned. It's a disgusting sight to see fish abandoned in rancid water.
You can see the photos of the fish I rescued and how horrible the water was that they were abandoned in at
my yahoo photos site