I am wanting to get a new aquarium. I have a 10 gallon now with 2 Cory catfish in it? I used to have 4 of them in there but 2 died in the process of the nitrogen cycle. The 10 gallon tank was my first fish tank I have ever had. It has proved to be to much of a problem to deal with. My question is, what are some good tanks that are no larger then 40 gallons that are good for beginners and easy to take care of. Now I have learned more and I will do the nitrogen cycle before I put on any fish and then I will transport my stressed Corey's to the other one if I decide to get a new tank. And any stocking ideas with those tanks you might mention would be great!