hello,just bought some clown loaches from pets at home (2 off)now been in the tank for 2 days and i think they have got white spot,none of my other fish have it,is it curable,did my tank cause it or did they already have it,had my water checked 2 days b4 i bought them and all the results were how they should be except the ph was slightly high,now another question,how many hours should you leave an airstone on for,and the tank light