i recently brought in some Rummy nose tetra to my 6ft community tank, had to replace a broken filter and thermostat heater. the tank has been established for 6 years
My fish have comedown with whitespot which has been treated twice (3 days apart) with formaldahyde and malachite green solution, we then noticed a glass catfish had fin rot and died, we treated with Tri sulphar.
There have been multiple rummy nose deathes, my Clown loaches look lethargic and my two big silver sharks have gone blind / have red gills and look like they want to bleed/ have peeling skin and are totally covered in whitespot!
what am i doing wrong? the water is being changed 50% tomorrow after the tri sulphar has been in for 3 days, have i over medicated the fish ?
i am at a complete loss and think i am about to lose my beloved sharks :(
Water quality has been checked:-
amonia /nitrites etc all normal , my water is a little hard.