I almost can't believe my Silver Dollars have ich. :sad Why? Because it's been years since any fish I kept had the disease. All the same, I was racking my brain to discover the cause... I just noticed the spots early this morning and have noticed it spreading on the SD's only. My conclusion is that either a change in temperature of the water as the tank is but 2 meters away from a window OR the introduction of the corys and neons last week brought something "fishy" to the tank.
Tank:
27 Gallon
-4 Silver Dollars (juvenile, about 1.5 inches each and who will be moved to a larger tank soon)
-3 neon tetras
-2 Pepper corys (juvenile size)
-2 Ottos
-Planted aquarium
-Aquaclear 150 filter
-150 watt heater
Water Parameters:
Ammonia: 0
pH: 7.2
nitrite: 0.1
Temp: 78.5 F
Let me know what you think could be the cause and what medications work the best! I have to buy the meds tomorrow so I need a prompt response. Thanks in advance.

Tank:
27 Gallon
-4 Silver Dollars (juvenile, about 1.5 inches each and who will be moved to a larger tank soon)
-3 neon tetras
-2 Pepper corys (juvenile size)
-2 Ottos
-Planted aquarium
-Aquaclear 150 filter
-150 watt heater
Water Parameters:
Ammonia: 0
pH: 7.2
nitrite: 0.1
Temp: 78.5 F
Let me know what you think could be the cause and what medications work the best! I have to buy the meds tomorrow so I need a prompt response. Thanks in advance.