How long do they last using that much water?
Thanks for the advice everyone. Does any place sell chlorine remover dosing units? I may just set up a gallon drip of chlorine remover so i do not have to buy filters. I'll only need to add about 6 drops a day.
I do realize that 40g a day is pretty light. But that still will result in about 15% water changes each week and I'll do manual 50% changes on everything monthly. Tanks will be lightly stocked with just breeding pairs so the only real concerns are the fry grow out tanks which I can adjust if needed. I think people tend to get quickly obsessed with water changes and how often they are needed. I know people that do 3 80% changes a week and people that do 25% a month. Both can work depending on the filtration and stocking. Nitrates are what dictate water changes.