Oh this is great. As a dad and a keeper of fish. I always have to tell my son to do bigger w/c on his tank and more often he does 25% twice a month on a 55 with a suncat 6" and a clown knife 7". Now I know that these two fish in this large tank don't produce a lot of waste, but the tank is heavily planted and clean water is so valuable to plants. With the stock list that was provided if it is fish only that you are keeping you could probably get away with 1/3 twice a month without any negitve effects. With plants I would do 50% a week. But as it sounds like you are doing, test your water. And go from there. I dident read the entire thread only half so if you have plants and that is a part of your hobby too then there are other things to test for not just what a standard test kit will have
I have lot's of plants in this tank.
I have lot's of plants in this tank.