I have it lower because it is harder for parasites to survive. my hydrometer says 1.020 is about 20 ppt I'm pretty sureIs that not very low ?
I work in ppt and the conversion would be around 26-27ppt as opposed to a normal target of 35 or 1.0264 sg
I would try bringing the salinity up slowly and see if that helps them out.

I still suspect parasite I just don’t know what to treat. Should I run prazi or copper?

