09-18-2006, 10:23 PM
Join Date: Nov 2005
Location: South Central Idaho, USA
iTrader Positive Rating: 100%
Um, when I see pearling like that, stuck to the plants, it's often coming from algae - but that's beside the point.
If your CO2 levels are too high, no quantity of oxygen in the water will save your fish. The plants will love it though. A pH reading doesn't tell you a dang thing by itself.
Best method - take some tank water and leave an airstone in it for several hours to bring it to equilibrium with the atmosphere. Read the pH. Aim for about a 1.0 pH drop from this number. This will give you a good concentration of CO2 almost every time, regardless of your water chemistry.
People make too much of pearling. To get it you need a large plant mass, good light, proper ferts, healthy plants, few fish, and relatively little surface disturbance. You can have perfectly rapid plant growth without pearling. You can also have pearling in water that will be lethal to your fish.