Hi there, last weekend I lost two fish. The first one, a Pristella tetra who was one of my first fish when I set up the tank a year ago had obviously been dying for a few days so I researched euthanasia and did the whole clove oil thing. It started with a curved spine so I quarantined it and took a pic to show the the pet store - just happened to be going to the city- and they said that it looked like maybe I caught it with the gravel vac. So I put it back in the tank with the rest. Oops. A day or so later it was acting rather lethargic so I put it back in quarantine where it stopped eating and I eventually put it out of its misery. That same afternoon I noticed my pineapple platy (had about 10 months) acting rather lethargic as well so much so that it got stuck to the filter intake. So I quarantined it and it was dead within hours. I don't know what disease might have affected them, they were not new fish and I hadn't added any new fish in months. I haven't changed the decor since I set up the tank a year ago. Although I did add some hornwort on the advice of my pet store which had started to die a few weeks previous but I did remove it. I am worried that the rest of my fish were exposed to whatever killed these two. If so do I take a chance and add another fish? My ammonia is at 0, ph is 7.6, temp is 78 and I don't have a nitrate test kit right now but I will be getting another as soon as I can. At the time there were 2 platy, 2 pristella tetra, 2 head and taillight tetra, 3 columbian tetra, 1 peppered cory and 1 assasin snail in the 20 gallon tank. I feed them flake food because that's all I can get locally, I do weekly water changes. Now to top this all off there was a power outage this morning that has fried my filter (Aquaclear 30) and heater. Again these are not things that I can buy locally. How long can fish go without a filter? Or will they be ok for a week if I do daily water changes? Thanks again for any advice.