I recently had an issue with my freshwater angel fish having a few small spots of fungus on her tail and red streaks up by her dorsal fin. So I treated the tank with antibiotics and malachite green to prevent any secondary infections, etc. I've never had an issue with my angel fish getting any sort of disease before and I've had her for about two years. My other fish is a Pleco that looks and is acting normal. After treating with the antibiotics I've had a hard time trying to re-establish the bio filter in the aquarium, and my angel fish started to get a weird sort of dented spot on her head, right above her eyes, which is something new and it freaked me out. I removed her from that tank and put her in a smaller hospital tank. I started to to treat her with antibiotics again yesterday because I thought that maybe it was some type of rot. I came home from work today to find her swimming wildly on her side at the bottom of the tank and the temperature had spiked to above 85. I unplugged the heater and removed it immediately only to find that it was COMPLETELY covered in eggs. Until tonight I had no idea what sex she even was. I guess the heat sped up her metabolism so much that she spawned. I'm not sure what the heck happened with the heater, but it usually keeps the water at 78-80 at the highest. 0.o The hospital tank is only 2gal and has a fluval nano filter. The main tank is a 20gal aquarium with a Fluval C2 filter (rated for use in up to a 30gal aquarium) and I use spring water, Fluval Cycle, Stress Coat, Dr. Wellfish's aquarium salt. I keep the PH at 7.0-7.1 because both my angel fish and Pleco seem to prefer acidic water. The main tank also has an under gravel filter. I'm hoping that my fish will be fine when the water cools down. I'm afraid to move her anywhere because I don't want to throw her into shock.