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It looks like beginning stages of ich. Slowly raise the temp to 86 degrees. Change out 25% of your tank water daily including a gravel/substrate vacuum. Add aquarium salt at 1 TEAspoon per 5 gallons of water. After a few days up the dose to 2 TEAspoons per 5 gallons. You can go as much as 1 TEAspoon per gallon of water.
If you have airstones turn them up. The higher the heat the less oxygen in the water.
If you want to use meds Ive heard that Kordon Rid Ich Plus has worked well. Also heard paragaurd is good too. Personally, if I can catch it early like you have I use the heat and salt method and avoid medicating my tank.