so convert to brackish. I had a brackish tank for a hot minute, its not too bad in terms of care. A little tougher than fresh water, but no where near as bad as salt lol. Give it a go, its a neat experience to say the least.
its essentially just a moderate salinity tank. Obviously not as high as pure salt, but some of the same factors come into play like replacing salt after water changes and whatnot. Not hard to maintain by any means really. I can't remember the measurements I was using for the salt I'd add but it wasn't a ton by any means. All I had was a pair of GSP's in the tank, neat little fellas, but there are plenty of other brackish fish that would be fun to keep.