I would just keep an eye on them, do water changes, raise the Temp and salt the tank for now. 84 might now be high enough though. I usually raise mine to about 88-90 but ask others before you do that and make sure u add enough salt. I use 1 heaping tablespoon for each 5 gallons of water and when you do water changes add that salt back based on how much water you take out. One more thing, do you have a power head in that tank for extra Oxygen?