u/BanhMiSuiCao

What is happening with my L183 and royal whiptail
I have a 20gal grow out tank with some baby l183, l333 and whiptail, recently I notice that 2 whiptail died and both got the white spot on there head before dying and now I have seen this on another one at the mouth. My tank is using a canister with 2 sponge filter and I always do 30% water change every week to keep the nitrate at 10-15.