Yesterday my husband bought me a fairy wrasses for Valentines Day. He bought them from the pet store here in town. I put them in the Q-tank and they looked fine, eating and active. Tonight I noticed they have tiny white spots on their body. I went to the pet store and they gave me some Mardel Maroxy and also some Mardel Maracide. The Maracide says its for freshwater fish. I asked him about this and he said it was fine for salt water also. I have not put anything in the tank yet. I wanted advice first before I started adding meds. I really don't want to loose the fish if possable. Also, the pet store won't take back fish they sell. Is there someone that can tell me what would be the best to do for the fish?