have a chance to buy a 125 gal tk with 6 fronts(2m,4f 4 to 6 in).) 2 black calvus(1m,1f) 2 yellow calvus(unknown)and a 5 inch clown loach. fronts look to be stressed more black than blue. tank is relatively dirty. two hob filters that need to be tossed and 4 sponge filters. all for $450. good deal, bad deal, steer clear? have till sat to make up mind. please advise.