Thanks!
Yep, I'm gonna do it and I'll update. I'm actually using Cuprion, I've this available so yeah.
Oh - don't use Cuprion! In that tank, Cuprion is going to be adsorbed by all that calcareous material, you won't be able to maintain a proper 0.20 ppm dose. Also, ionic copper is pretty toxic and not well tolerated by some angelfish. I've used it on emperors (decades ago) and they did "o.k.", but for sure don't use it on pygmy angels.
Jay


