My planted 20 gallon long is stocked with tetras, corys, and a couple plecos. The pH is 7.9, and my GH and KH are both over 160 ppm (9 dKH). I bought some Fluval Peat Granules to try to SLOWLY soften the water and get the pH below 7.
Does anyone have any experience with Fluval Peat Granules? I'd like to play and safe to avoid shocking any of the fish.
Also, could i put it in a Tetra Whisper hang-on-back filter?
Any other ideas would also be helpful.