I have a 20l long packed full of rapidly growing paly colonies and even with 3 striped damsels constantly over fed I struggle to keep nitrate detectable. Nitrate needs to be kept at least 5ppm or paly growth suffers. Stump remover works fine for me.
Stump Remover works and I've used it before, but the quality is not the best. There are much cleaner/pure options such as Loud Wolf or what Triton is selling. I had to move on from Stump Remover.