Hello all i hope this is in the right section but anyway today when i woke up i checked my 20 gallon tank and my two yellow tail damsels where acting strange they where swimming vertically tale facing down and all of my cleanup crew had died apart from on hermit crab all my coral are doing fine apart from my hammer coral which has shrieked dramatically. so i tested my water today and everything seems normal salinity is 1.025 ammonia is 0pp nitrite is 0 ppm and nitrate is 10 ppm ph is 8.1 kh is 179 dkh is 10. the only change to my tank is that yesterday i done a 20% water change and change and switched salt from red sea salt to red sea coral pro salt am i right in thinking i have messed up ?
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