Parameters: 33 gal. Tank. Ph: 7.4. Ammonia: 0.50. Nitrites: 0.50. Nitrates: 5. did 25% water change yesterday. I have 6 Tb, 11 tetras, 1 pleco, 1 albino rainbow shark. Tank has been running 3 months and has been cycled. Gravel substrate, 3 hidey holes, 2 plastic plants, and a few live...