I would be grateful if anyone could shed some light on the problem I've been having.
In both of my tanks, fish will suddenly die with almost no warning signs. It only happens to one, maybe two at a time while the others seem perfectly healthy, and the fish that die show no outward symptoms of disease and I haven't been able to spot anything after removing them from the tanks. They'll be fine for weeks on end, and then one will die overnight.
Both tanks are fully cycled, pH is neutral, I have no notable algae problem, and I do frequent partial water changes. There's no overcrowding, in fact I keep them very sparsely stocked (even more so now that they have been dying
). One tank is a heated tank that I keep rosy barbs and bala sharks in, the other is a larger cool tank that I keep small comet goldfish in.
I've tried everything I can think of: extensive tank cleanings, bought new dechlorinator and water conditioner, changed foods, added aquarium salts, but they keep dying one by one and only show signs hours before they die. The only symptoms I've noticed are mild discoloration and they'll hide or lie on the bottom or lean against the pump when they're about to die.
I've never had this problem before, and only happened when I moved into a new place, but this doesn't sound like heavy metal poisoning to me or anything environmental. Honestly, I'm at a loss as to how it can be happening in both tanks simultaneously with the same pattern - does anyone have any thoughts at all? Thanks!
My Tanks
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