This morning when I woke up all my fish looked normal. When I came home seven hours later I noticed one of my velvet swordtails has a large white spot at the very tip of her tail, and another small spot on her dorsal fin. I'm not quite sure what this is yet, because the larger white spot seems way too big to be ich, it's the size of the tip of a pen. But the other spot looks like a small speck of sand. Neither of them look fuzzy.. I'm not sure if this is ich or the beginning of something else.. I haven't introduced anything new into the tank except a large lava rock. I know ich can develop at any time, but more so when you add new fish. Everyone has been here quite some time, the only new addition is the lava rock.. Here is my tank setup: 29 gallons 80 degrees 1 HOB and two sponge filters Heater Bubble wand 0 ammonia, 0 nitrites, 20ppm nitrates Heavily planted Flourite black sand Fish: 2 female red velvet swordtails 2 female koi swordtails 7 neon tetras 1 mystery snail 2 rabbit snails 1 nerite snail None of the other fish show any symptoms of this. Everyone (including the swordtail in question) is behaving normally and appetites are good. I don't notice anyone showing any signs of lethargy or rubbing against any tank ornaments. My question is, should I start raising the temperature in the tank as a precaution? Or should I wait and see if this develops? Also, I know the neons are very sensitive to temperature and water parameters, would raising the temperature cause them to die? Would the snails be safe too? Because my snails are honestly my favorite part of my tank.. I've been trying to take a picture of the sword but every time I come near the glass with my phone she hides in the plants. I'll try my best to get a picture soon. Guys, I just need to know if I should start raising the temperature in the tank now as a precaution.. Or if I should wait and see if it's a confirmed case of ich. And will the heat harm my neons or my snails. Please help!