Questions in Cleaning/Disinfecting

How to clean or disinfect aquarium equipment

• I have a 40 gallon tank that had about 10 angel fish and five tetera 2 cat fish and a frog...about 4 of the angels caught fungus from a fish that i bought from the pet store. I tried several medicines nothing worked till i finally bought gel-tek and hand fed each one the medicine including the one that was practically dead on the floor he's doing fine. My question in how do I disinfect the tank so that they dont catch this horrible disease again? Please get back to me soon...thanks mari
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• I have one of those gravel vacs and im not sure what its supposed to do i followed the directions but it seems to just suck up the water and not clean the gravel and when it gets the gravel i run out of water. What am i doing wrong?
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• How do I know if it's safe to add rocks I find to my tank?
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• How do I disinfect/sterilize my aquarium tools?
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