I posted a few days ago because I thought my guppies developed a case of ich. I've been treating the tank for a few days now with Rid Ich, adding salt in the water, and raising the temperature. It seemed like they were improving, but now things are getting worse. I've lost two guppies in the past two days! I've noticed that some of them are getting white film on the ends of all their fins. Whats the problem?? Is this ich or something else??