It’s like eating a scouring pad. Chaeto is simply too tough for the fish to easily chew. … There are not just one but two incredibly hardy macroalgae species that sequester nutrients at just as high a rate as chaeto and are extremely palatable to fishes.

What does Chaeto need to grow?

Chaeto grows with light and nutrients, Phosphate, Nitrate, and Iron. If the nutrients are lacking the chaeto doesn’t grow. The marine plants and phytoplankton all compete for these same building block nutrients.

Where do you put Chaeto?

I would place in between your intake and outtake of your sump. Somewhere it can get good flow and light.