So I am looking to buy a new tank for my Red Cap Oranda. She is about a yr old approx. 2 inches long and is currently living in a 20 gallon long tank. Anyway, lately she has seemed depressed and listless, resting at the bottom of the tank facing the corner. She will become more active at her feedings and if I come toward the tank but otherwise she is just sedentary. AMMONIA AND NITRITE AND ARE BOTH 0. Nitrates are 10, so I don't think its a water quality issue... I thought perhaps she might be depressed and lonely since I know goldies are social and like to have that stimulation. In order to get her buddy I need to upgrade to a 30 gallon (I live in a dorm and cannot accomodate anything larger) as far as space goes it would fit better in the available space if I got a 30 gallon bowfront (taller rather than longer) but I had heard that increased surface area in long tanks is better for oxygen exchange. So to get to the point... would it still be beneficial to get the 30 even though its not ideal dimensions???? Or to overstock the 20 long just so I can get my seemingly depressed goldie some company?