Fish slowly dying with no signs of ailments!! Parameters are fine all the way around!! I had a little ammonia that was corrected quickly though lfs said it wasn’t enough to panic about no big deal just correct the issue no harm no foul… my fish started dropping before ammonia was detected and continue to slowly die weeks after correcting.. no outward signs of any disease.. lost these in order 1.skunk cleaner shrimp 2.scooter Blennie 3&4 at same time overnight powder brown n scopas 5.Randal goby 6. Fox face rabbit … prior to these passing I found the sailfin breathing heavy on the bottom and moved him to another tank and he recovered … clown fish seemed ok through all this but today i became concerned as my snowflake seemed to be breathing heavy and the clowns were moved also..tank is 180 total volume including sump 3 years old maybe 3 1/2 .. mixed reef now some of those seem a little stressed.. I’ve performed water changes using ro water… the only other thing was my salinity checker was off quite a bit and I was at 1.030 I don’t know how long and a may have made the correction to quickly? Over approx 12 hours ?