Eagle92546 Posted June 10, 2021 Share Posted June 10, 2021 I set up this 90 gallon tank about 3-4 months ago. I took GCory's lead and progressed slowly. Established an undergravel filter, added cryptocene plants (dozen or so), a couple of amazon swords, etc. NO fish yet! Added some biological filtration via a "seasoned" sponge filter. I let the tank "mature" for a couple of months, finally adding some white skirt tetras (5) and did nothing for another couple of weeks. More white skirts. More patience. Two weeks later I added two 3" discus and let them enjoy their new environment. Meanwhile, I was monitoring water parameters, etc...All good. I couple of small water changes (10-15 gallons) All is well. Couple of weeks later, two more Discus. Slow and steady. I even measured out the flake food (1/4 teaspoon) so I would not be overfeeding them. Two weeks later, Cory catfish, about 6 or so, followed by 6 more two weeks later. All is well. Waited two weeks before I added my Blue Diamond (5") Discus and kept a close eye on everything. Water was clear, fish were thriving and besides a couple of 25% water changes it looks a though my "display tank" was becoming a reality. Now in the fourth month, tragedy struck this week. The discus were huddled at the top of the aquarium, but not grasping for air. Just huddled together. Next day, a dead white skirt, then another that evening... I did a 35-40% water change with some fish "improvement" but the white skirt deaths continued, then the catfish, one by one. Another water change (35-40%). Some General Cure meds. Now, a dead discus (3" ones) then another, White skirts all gone. No more catfish. Three more 3" discus. Just the 5" and a couple of 3" discus are left. I expect a total collapse by the weekend. WHAT HAPPENED????? I am at a loss. Blue Diamonds look as though their skin is falling off, except there is no ammonia indicated nor a pH crash. All test "normal". I have had these Discus for over two years, raising them from a quarter size only to kill them in my 90 gallon "dream tank" As a footnote, considering with this tragedy, I had a outbreak of black hair algae. Any thoughts will greatly appreciated. 1 Link to comment Share on other sites More sharing options...
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