I have had my 35 gallon hex tank for four months now, thought it was cycled tested the water and looked good. Put Molly fish in (7 intentionally under stocked). The tank seemed to be doing fine with a few ammonia spikes, then I put driftwood in and it seems that the ammonia spikes got worse? It’s been weeks now since the driftwood and still major spikes. Yesterday ammonia was .25 and I did a 25% water change…. Today tested it again any it is between .25-.50!! I have another established fishtank I seeded this tank with, I just don’t know what to do and don’t want to loose my fish. Doing another bigger water change and will probably dose with stability for a week. Any other advice?