I am interested in suggestions for beginner species, I am interested in a species that is not extremely tiny, but obviously not very large either.
A friend said he would give me a 10 gallon tank (we think it is 18?x12x12, or close to it). I think about 2.5'x1'x1' is the absolute largest I could have anyhow due to space concerns, so I think this 10 gallon should be enough? Other than this, I have absolutely no idea for the costs or equipment that are required (filters, temperature control, ph control, anything)
I am also wondering about how much it costs to feed the fish, and also about how much these things COST. It seems like these exotic species might be very expensive or hard to find. I am in Northern Virginia (USA). I think that going online to buy fish would be REALLY expensive if not just because of shipping, plus I would like to see the fish in person to get a feel for if I like them or not if that is possible.
Any other concerns I should watch out for? Tips and stories about beginner mistakes gone wrong?
Looking forward to hearing from you pros!

Robert Lorentz