I have some ammonia, nitrite, and nitrate test kits by API that say they are for freshwater and saltwater. I've taken both FW
measurements with them and they seem to work great.
I recently bought their "Saltwater Master Test Kit" which comes with those tests, but it doesn't say anything about working for freshwater tanks. I can't think of a reason why it wouldn't work on freshwater when their other tests do, but I thought I'd ask. Does anybody know if I can use the FW
color cards with these SW