I have used excel before and it only made things worse.... Not only does CO2 come from fish/decaying organics, it also comes from the room where the tank is housed
I have also just begun to dose firts in my 29 planted with 2xT8, I use hydroponic ferts I have lying around. Fert choise wasn't very scientific, I chose ferts based on what I thought my tank needed; also paying close attention to the ingredients, trying to stay away from things like urea, ammonia, nitrogen and copper (or choosing ferts with very low copper levels). Dosing amounts were chosen based on the MSDS report as they are hydroponic ferts and the given dosage hovers around 2.5-15ml per gallon.
Every wednesday I do:
10ml fo Technaflora BC bloom: 1-4-7(1% nitrate, 4% P2O5, 7% K2O, .85% Mg, 1.37% S, .0072% boron, 0.0027% copper, 0.024% Mn, 0.00012% Molybdenum and 0.0139% Zn)
5ml Technaflora thrive alive green: (1%N, 1% phosphorus pentoxide, 1% K20, 0.01% Fe)
3ml of Seachem flourish comprehensive: (0.07% N, 0.01%P2O4, 0.37% K2O, 0.14% Ca, 0.11% Mg, 0.2773% S, 0.009% B, 1.15% Cl, 0.0004 Co, 0.0001% Cu, .32% Fe, 0.0118% Mn, 0.0009% Mo, 0.13% Na, and 0.0007% Zn)
5ml of Technaflora root 66: (2% nitrate, 3.25% calcium, 1.25% Mg, 0.11% Fe)
Considering adding humic acid, no idea how it will affect the turbidity. :icon_roll
I know people with high tech tanks follow regements like the estimative index, that involve large water changes when dosing. I also know that low tech tanks (such as myself) don't do many water changes (maybe 5 per year), in order to keep CO2/O2 levels consistent. But with all these firts going in the water, it may be helpful for the sake of the fish to do a small change when dosing ferts. Whatever I'm doing it is appearing to work... for now.
You can find water quality reports at ewg.org . Punhced in a random Hawaii zip here