Hi all,

Been doing some research online about keeping algae in the tank and maintaining "green" water.

I've read some conflicting things. Some people say algae can change the PH, which I must admit has been my experience.

I like having the algae however, my reasoning is that while I'm trying to keep my water as clean as possible, I like the idea of my tank replicating a pond type environment as much as possible, in order to create a more 'natural' biosphere for the fish.

Has anyone else had experience with algae changing their water ph?

-A

Just like any other plant, algae consumes carbon dioxide (CO2) during the day (which raises pH) and produces CO2 at nite (which lowers pH). So you'll see a daily swing in pH. How large the swing is depends on how much algae/plants and your KH (buffering capacity). You may want to run an airstone at nite to gas off CO2 from the green water.