After a few failed attempts with fish in my 10g (mostly due to adding sick fish to the tank) I put in two small comet goldfish, with plans to move them to larger tanks as they got bigger. The larger of the two died but the smaller one is thriving in the 10g. He is alone (not sure if he is male or female but we call him a he). He eats well and is slowly growing. He started off about 1 inch long (not including tail) and is now about 1.5 inches (not including tail). He is about as big as his tankmate was when we first got them. My husband has named him Scroob (Spaceballs anyone?)
He eats a rather varied diet. He gets his goldfish crisps almost every day but a few times a week I give him something different. He gets bloodworms, brine shrimp, algae wafers, and fresh veggies. There are also pond snails in the tank and I've seen him picking off a few really tiny ones off the glass a few times. Anything else I can be providing?
Water conditions are wonderful. This is the first time I've ever fully cycled a tank and it was cycled before he ever got put in the tank. I keep an eye on ammonia, nitrite, nitrate, and pH and everything is doing great. Ammonia is always 0 (though a few times after cycle was complete I've gotten a small amount of ammonia. About 0.5, but it would go away within the week) Nitrite is always 0 and Nitrates never get above 20 as I do weekly water changes. I use API Stress Coat for water changes and I also add API Stress Zyme to the tank every week. The tank has some driftwood (unfortunately I used new wood and the water turned the color of tea.) and some live plants and a few artificial plants. I plan to switch out the artificial plants for live ones as soon as I get a better light, though I might wait to get a bigger tank before getting the new plants. Temperature is room temperature which in this house is around 70-72.
I'm not sure when I'm going to be able to get a larger tank as we are not going to be moving as soon as we thought we were. It might be a few months. He is only 1.5 inches long (not including tail) so how long do you think he'll be able to be healthy in a 10g with weekly 2 gallon water changes?
And I suppose the point of this post is to ask if there is anything else I can be doing for him to make sure he is healthy and happy? (other than getting him a bigger tank) I was thinking of getting another small 1 inch comet to be with him.