I have a 55g freshwater tank.. it came with all the set up... gravel,fiilter,water conditioner ect. ect.. but I noticed later they set me up with a "UP TO 50 GALLON" bio filtration system.. is 5 gallons really that much of a deal?? I have 3 Corys,5 Gouramis,4 clown loaches,3 guppies,1 female betta