I need to buy a new FT for my new system i want to set up, but i cant find a cheap FT.   i want something around 600gallons maybe more maybe lil less but something around there.   all the ones i can find are in the thousands.   Wat is something cheap i can buy and use as a FT.   like for my already running system im using the 275 gallon "tote"  i wish they had 600 gallon "totes" :).