this seems to be the only thing fosters carries that I could pick up tommorw as far as formalin goes. Will this work as a 45 minute bath between tank transfers. And if I have to get different copper since I have ionic will this work just in case I can't get cp
Yes, but you have to be EXTREMELY careful with coppersafe. If you go by the label you'll wind up well over the safe concentration of copper.
https://www.reef2reef.com/threads/c...instruments-high-range-copper-checker.368943/