Peroxide as an Algaecide for Small Ponds 

API Algaefix is rubbish. I had experimented with almost all types of algaecides in planted aquariums. Copper sulfate is the the most potent but the therapeutic window is too narrow to be practical (it's more likely to be toxic than an effective treatment). Hydrogen peroxide is the best algaecide for a lot of reasons except perhaps in cases of green water algae where UV filtration is more effective. I had settled on a maximum dosing of 1ml of 3% hydrogen peroxide per liter of water for nuking algae, specifically blue-green algae. I had no issues with fish, shrimps, snails and most plants at that dose. Some sensitive and simple plants like mosses and Vallisneria can wilt though. I agree with your strategy of removing dead material following treatment as the nutrients in decaying matter will leach back into the water and possibly start another algae bloom. I do a massive water change with siphoning around 24 hours after treatment but that may be impractical to do for a pond.

I use 3% hydrogen peroxide (in small amounts) to combat mold and algae on my seedlings soil surface, in a tiny mister bottle. Works great.

Put a cooper pot in the water, something decorative

Put some copper screens on your water intake

Make sure beneficial bacteria is high enough and try Barley Straw extract to stop algae from multiplying.

Get food grade peroxide, its 25%(use with caution) and the cleanest version available. If you have water circulation, use copper pipes where feasible.

Copper helps alot

Istall a piece of copper flashing under your waterfall! Pound it out and make it look cool and fitting.

have you emailed any of your local UF IFAS extensions? They tend to have tips and sometimes even free tools for stuff

I wonder if you can use it for clear self watering containers just for plants

Hi! What ozone free uvc lights do you use now? The old listing is no Longer available