I have a strange story, maybe? A bit long, I apologize.
I was having a problem with red slime algae after changing type of salt (maybe just coincidence). I went to the lfs
and was shown a product that resolved this issue without harming any tank content (so the box and the LFS
salesperson said). I placed the prescribed amount in the tank on Monday before xmas, all seemed well at the time fish were acting normal. Tuesday both clarkii's were acting really strange kind of sitting on the bottom of tank in corner. Gave some food and everyone went back to normal and seemed ok that night. Wednesday morning one clarkii was acting normal the other was again not right, this time swimming upside down behind overflow. I took him out of the tank and put him in isolation, he died within hours. All other fish looked fine and were acting normal. Christmas day all seemed well and I did a 20 gal
water change, and cleaned all the filters and pumps just to be safe. All seemed well, but next day 2 more fish died (one in morning another couple hours later). Now it is Sunday and I have lost all but 2.
Water levels were all normal before water change except Nitrites:
Ammonia - 0
PH - 8.3
Salt - 1.023
Nitrite = @ .25
Nitrate = 40
120 gallon tank, the urchins and hermits are fine the fish still alive are a wrasse and a small grunt. The goners 2-clarkii's, 2 damsels (yes damsels), and a gobie (big one 5")
Feeling like an evil grench!!
My small tank is doing great and water readings are same except nitrites are 0.