@Humblefish you mentioned wanting to try copper power in another post. I know that this a chelated form of copper unlike cupramine (ionic). My question is, is there a better form of copper to use for fish without scales, or smooth fish such as some puffers or eels? I plan on using ttm, but I want to learn as much as possible as I am new to this. If it is not wise to use copper at all on these smooth fish, and you can't use ttm, what would be your suggestion for new fish purchases before adding to the DT? Thank you in advance!