Is there such thing as too much Chaeto?

[Tiny Ocean]

Is there such thing as too much Chaetomorpha? About one ninth the volume of my tank is occupied by a lovely puff of healthy green Chaeto.

It seems to me that the more Chaeto I have to uptake ammonia and nitrates, the less I need to worry about ammonia spikes and the more I can feed the shrimp. I had a good brown scum built up for them before I put them in their current tank but now they have wiped the sides of the aquarium as clean as a wineglass in Buckingham palace. The limestone rock in there did have some brown scum and green spot algae but now it is immaculate pure white.

Maybe I have too much Chaeto and there isn't enough nutrient left in the water for the microorganisms? Or maybe I need this much chaeto, and more, to stabilize the water so I can increase inputs for the microorganisms?

It's a gallon tank and it has only 20 opae ula and roughly as many *small* MTS in it. Definitely not too many.