Looked at your log. Looks like you are on about Day 13 since first ammonia dosing. Your pH sounds high enough to be ok for the bacteria. I assume you're up at about 29C for the temp. It's not all that uncommon not to have much ammonia drop in the first two weeks, so nothing to worry about there. I can't remember that much about the Interpet filters, I assume they don't have any chemical resins (usually white chemicals, not ceramic pieces) that might be removing the ammonia so that the bacteria can't get it, right? What media do they have?
~~waterdrop~~