I'm new to the hobby. I have a 55 gallon tank that has been up for 16 days. My ammonia was high so I used API ammo-lock according to the bottle. Yesterday I did a 20% water change ammonia was still high after following direction for a week. Yesterdays readings were 7.6 ph, 8.0 PPM ammonia (I'm sure that the ammo-lock converted to non toxic for but still reading high) 0.25 ppm nitrites, 40 ppm nitrates. All the fish seem to be doing fine except 2 fish. An angel fish has been hiding and it looked like it was rubbing itself on one of the artificial plants today. The other one fish has white spots on it's tail and fins near it's gills I noticed it 3 days ago. So I thought it was ich so i raised the temp to 80. my heater won't heat past 80. I also added salt to help. There has been no change in spots or any other fish infected that I can tell. I don't know what to do from here. I attached a couple of photos of the fish with the spots.







