So today I almost had three Discus fry (1-2") die on me . I was carrying out my water changes , when halfway through I noticed two discus were on their sides lying on the bottom of the tank being swept around topsy-turvy by the current (which is minimal). I grabbed both of them and held them in my hands just below the surface over the bubbler so they wouldn't be jostled. 5min later they both swam off and were fine . About a 1/4change left to go and I have my 1 smaller one on the bottom completely drained of colour just like the other two . I thought he was a goner but repeat procedure his colour returned slowly 15min later he swam off - nothing has changed; my routine for the past week has been identical .
What did I do wrong?
My water goes from my tap to a holding bucket where its heated and aerated - I only ever add Prime , it is then pumped slowly into my tank.
The water temp change goes from 86 to 84
pH is 6.6** (Sorry realised this typo too late)
I do 90% changes daily