01-07-2008, 04:31 PM
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There are 2 risks here... 1, when you boil rock, depending on what is in it, some metals and minerals can react bad to the boiling temperatures and cause chemical reactions that can endanger your tank.
The other risk is that using rocks from your yard, you could easily be adding parasites, pollution, and who knows what other kinds of contaminant to the tank. Boiling will not remove everything. You would be much safer taking those rocks out and buying some specifically ready for aquarium use. The companies that sell rock for aquariums treat the rock to make it safe first, and their treatments are not something practical to do in the home.
I agree with the others about the worms... tends to come from too much uneaten food allowed to remain in the tank over a long period of time. More water changes and less food as Lupin suggested are the best cure. No worries, they worms won't hurt your fish. The water quality would be the thing to hurt the fish.