More pH problems
I posted here a few weeks ago about issues with my water and my two dead cories. :( So my stats as of right now...I've got a betta in a 2 gallon bowl waiting to be transferred to the 10 gal. The 10 gal has only been cycling for a week, but I'm not seeing the results I expected to see with a fishless cycle. I completely redid the tank because of the bizarre problems with pH I was experiencing. I now have new gravel, the same plants, the same filter, and the same decorative thing. Last Saturday I poured out the old gravel and rinsed out the tank with hot water. Since I didn't want to kill all of the bacteria I've cultivated I skipped rinsing the decoration. I put everything back together with the new gravel and tested the water levels. A week ago ammonia was 0.25, nitrite 0, nitrate 0, pH 7.6. All of this was tested with the API liquid master freshwater test kit. I tested the water on Sunday and got the same results and Monday the ammonia was up to 0.5 but I think that's normal for tank cycling. I didn't test for a few days and today I tested again and ammonia is up to 0.75 ish and pH is down to 6!!! This is the exact same thing that happened last time. What am I doing wrong? Should I get a completely new filter cartridge?