Clear water can have a lot of meanings !

It is not uncommon for a fertile pond to have a strong spring/early summer bloom with it diminishing (or going from green to brownish) over the summer as forms of plankton change due to productivity and predation. If you are fertilizing that is when you add small amounts of additional fertilizer to try and keep 18 to 24 inches of visibility.

I do not believe in whip-sawing different treatments and approaches as that often has very negative consequences that can not be anticipated or controlled. Here I add an old Bruce Condello admonition - it only takes about 15 minutes of mistake (low O2) to do a lot of damage.