Welcome to the forum, have you thought about aeration.
I hadn't, yet. This is all new to me, so I'm just trying to figure out what I need to do. Aeration for a pond is a new concept, I hadn't heard of before browsing this forum.
With aeration I would go with HBG 40-50 , YP 15-20, HSB 5 , you could also feed these fish pellets which is fun as well.
Interesting mix, and I'm intrigued, because Perch are my favorite.
