I agree with the Prime suggestion. But as for the milkiness I think that is just bacterial bloom. Nothing to worry about, in my experience though I have not had one for years. Just feed the bare minimum for as long as it takes to clear, and do water changes as per usual (vacuuming the gravel I assume but if not, do that too). Also not sure of your filter maintenance but if you can clean them out too that will accelerate things.