1. Yes you should always treat tap water with a dechlorinator.
2. Heat isn't always the answer for sick fish. Heat is commonly used to speed up the lifecycle of ich so it can be treated faster. It doesn't heal fish by itself. You need to find out whats wrong with your molly. A quarantine tank is best used so you can treat the sick fish and not stress out the others.
Healthy fish can go 7-10 days without feedings. It will stress them a bit but shouldn't be a problem for healthy fish. Automatic feeders are cheap enough now to avoid this problem.
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Member of the AGA (Aquatic Gardner's Association)
Member of the IBC (International Betta Congress)
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