that is a big tank there.. if you want to justify having a tsn or rtc maybe you can find one in need of rescue, that way you have not bought something that will be replaced by the lfs the next day, and you have spared it from a VERY early death.. I have a tsn in a 7x30x30 and I know that this will be too small one day but I think what I did was right since I saved it from an even smaller tank.. just my opinion though..