im going"shopping" on the 30th and i need to know the type of filtration nd air flow that would be neccarsary for 40-30 gal brackish? basically what would be every thing i need for a brackish tank besides the tank-fish-live sand-heater and what not, like i want to know from people with expierence with a similar sized tank on everytihing the it would need to be "brackish", i want to know what i need to check the ph and and know the salinity, i need to know the type of power head ands different canister filters i need to get to make this the tank iv been wanting. also i was wondering from poeple who have gone through with all of this if thi is going to be under 200? since i have what i think most of what the tank needs, or is this going to cost me an unexpecting fortune...which i have already spent.