Lots of water changes. LOTS! Better to do small ones every day or every other day. In the last 4 months you have probably noticed that doing a 50% water change does not lower the KH with 50% but barely nudges it down (if any). Basically you need to keep changing water.
I would immediately switch to AquaSoil. Every other product on the market should be labeled "substrate" with big thick quotation marks. But if you have to have the EcoComplete ask yourself a question:
Do my plants do well with the Eco?
If they do don't run after KH or any other parameter. With Eco you can't really use the CO2 table, but that doesn't mean that the CO2 you are pumping in the tank disappears into the nothing. Just you can't double check. I actually think that using EcoComplete is a good learning experience - it teaches you to not rely on test kits, but to look at the plants.
--Nikolay
I would immediately switch to AquaSoil. Every other product on the market should be labeled "substrate" with big thick quotation marks. But if you have to have the EcoComplete ask yourself a question:
Do my plants do well with the Eco?
If they do don't run after KH or any other parameter. With Eco you can't really use the CO2 table, but that doesn't mean that the CO2 you are pumping in the tank disappears into the nothing. Just you can't double check. I actually think that using EcoComplete is a good learning experience - it teaches you to not rely on test kits, but to look at the plants.
--Nikolay