Update on Old Tank Syndrome
Well, I'm happy to report that the nitrogen cycle has kicked in again and tank parameters are mostly under control (Ammonia 0; Nitrite 0; Nitrates around 40 due to missing a change), BUT the pH is still off the low end of the test parameters (6.0). I can't figure out why, as there have been no decorations in the tank for at least 3 months - only water, white rocks, fish and one type of plant.
I have some driftwood I want to add to give my poor pleco a hiding place. Should I fix the pH first (and if so - how?) or can I put it in and keep working on water changes? Many thanks for your input.