Here is the short form:
Sat, bought a new pleco. It went into my QT tank with other members that were just on the mend and almost ready to be transfered to their new home. I thought it may have been a little ill from the LFS so I treated the tank with 1/2 doses of Melafix, Pimafix and 1/4 dose of Paraguard.
That was mistake #1
Within 12 hours the pleco was dead. Neon tetra was dead, molly was dead, and 2 Angel fish were sick (one large and one small)
The fish, and driftwood were covered in slime (see photos one and 2). The tank turned milky white similar to several at the LFS.
At this point, I did a water test and the ammonia was off the scale at 9.99. I did water change (80%) and the ammonia was still 9.99. I did a 2nd 80% water change and still 9.99 although the the tank was no longer milky white. I rinsed out the filter and added carbon at that point and called it a day.
The larger angel passed this morning and the smaller one survives but is blind.
Today, I tested and the ammonia was still off the charts at 9.99.
Nitrate .01 and under
Nitrite .02 and under
I did another 80% water change.
Latest Ammonia result 7.94
I don't mind doing the water changes 2x daily although they are spaced shortly in between.
Is there any chance the surviving Angel will regain its eyesight? Feeding is difficult at best as it just wanders around aimlessly.

