I've just lost my Dwarf Gourami in my new cycled tank (60L / 15 gallons). It just died and it happened very very fast. I was talking to my neighbor for a few minutes, and everything was okay before it. When I came back, my fish was dead. It wasn't dying (it was not swimming upside-down or making any movements), it was just already dead.
That was a little bit "territorial fish". He was pushing some of the other fish away (but not that much). And the only fish which was sometimes pushing that Dwarf Gourami away was my Powder-Blue Dwarf Gourami (but not that much again). I mean there was no real stress-situation in my tank because of aggression.
There are however other serious problems since the last week when I noticed blue-green algae (cyanobacteria) and I ordered a med against it. It took some time until it arrived. During that time I had ammonia spike, then nitrite and nitrate spikes, as well (most probably due to cyanobacteria). I added 1.5 teaspoons of aquarium salt to my tank. And I was changing 30-35% of the water every single day, without adding salt anymore, until the med has arrived (every evening I got the spikes back again). I feed my fish once a day and not much, especially now. Today it was day-3 of treatment and I may not change the water anymore for 7 days (= 4 more days), until cyanobacteria are gone. Maybe the medication has killed some of the good bacteria too, I'm not sure, but it works against the cyanobacteria very efficiently. And I don't know if I may add some good bacteria to my filter media (this is my first question
After my fish died today, I added JBL-Detoxol to decrease some toxic spike-params in my tank.
I have two more questions. Is this JBL-Detoxol compatible with antibiotics I have added to my tank, or will it break it partially down together with other toxins (for which I added it to my tank)? If so, is it recommended to add some antibiotics today/tomorrow again to keep killing the cyanobacteria?
And my last question is: what else can I do to save my other fish from dying during this difficult process of treatment? I really have no other tank and no time anymore to cycle a new tank for my other fish. And I really don't want to lose any other fish again. I feel kinda blocked right now.
In addition, the test results at the moment when the spike began (before treatment):
Ammonia (NH4+) >0,1ppm