in a 10 ? wow,hhmmm..thats kinda bad IMO..they do show up small at some lfs,mine was about 2in long and about 1 in high and started him in a 45 gal high for about three months,but I already had a 125 setup knowing thats where he was going,these fish are really like a pet ,they get to know you and flap the fins hystaricly when you are near,those are there natural blue eyes,be warned though they eat Alot and are very messy,you need exellent bio filtration o r they will put a major strain on your tank because of the waste....otherwise these fish are pretty easy to care for...HTH