First off, CO2 injection won't work--I've tried it and there's too much surface agitation in my tank. That said, is there a safe/reliable way to lower the pH of my water? gh and kh are around 4-5.
Everything I've read about ph-altering chemicals is bad. Is peat filtration reliable? That is, will my pH be stable and if I change the peat, will my pH suddenly change? Does the amount by which the pH change depend on the rate of flow through the peat? Doesn't peat soften the water? I'd rather maintain the hardness and lower the pH.
Thanks--I think my plants would benefit from a lower pH (its currently 7.8). They don't seem too happy at the moment.