Hi, Chris,

Algae by itself will typically stay suspended in water....even undisturbed water.

You are certainly doing all the right things but, since you mentioned that your algae was "on the bottom", I think you've got some other solids in there, as well.

Running your pump and getting them "stirred up" will get rid of whatever it is.

Have you done any testing this Spring to check the status of your water? That'll go a long way towards affirming your common sense approach

Dave S.