I just started using peat in my eheim 2213, and so far after about 10 days of running, the water is beginning to show signs of the yellow tannins. I'm aiming for an amazon type water quality, and the main inhabitants of the tank will be schools of tetras, mainly rummynose and cardinals. Can I over-do-it with the peat? The peat itself is in a filter bag, so none of the larger particles are escaping into the tank. The water parameters are fine at the moment.