I used this handy tool to calculate my final fish load for my tank and filter (I am 1 cory and 3 guppies away from my goal) and it claims that my filter will only filter 72% of my tank and that it (the fluval 205) will only efficiently do 26g (mine is 30g) Fluval says that the 205 will do 55g if you check out their website! Eek! Should I just ignore the advice of this site? Also it says not to keep swordtails and platys together, do I need to relocate one or the other? Any advice?