Guys, Ive got a situation and Im hoping for some solid advice. My Dad has about 15 tanks in his basement. Filled with gravel of various colors but mostly red. 10 plus years ago he was no longer able to care for them because of work and health issues. He got rid of his fish and emptied the tanks of water, the gravel stayed and now is covered in dust and who knows what else. He now is retired and working on the health issue and asked me about getting the tanks cleaned up. I told him it is a pretty intense job as they are very dirty but Im willing toput in the elbow grease to clean everything up. I probably would have tossed the gravel and started over but thats not my dads style. So I guess my biggest question is how to clean this gravel and how to get the tanks clean. Thanks in advance.