Subject: Algae Eater pH levels > Karen, are you saying the PH 6.8 is too low to support healthy p > growth? My 55 is a jungle at PH 6.4-6.8! I have 25" high swords > out of the top. No, a pH of 6.8 (or even 6.5) is fine for most aquarium plants. The original poster was talking about dropping the pH to 4 or 5! Karen Randall Aquatic Gardeners Assoc. Boston, MA