Hi there ya all!
This may come as very dumb question but still I have to ask. Explanation comes frist though. I want to add some more bags of crushed coral to my hob filter and already have a bag that was left when I took apart my tropical aquarium. There I used it as gravel to cover the bottom. The one that I didn't I use I have converted in filter media. So the question is: can I use the coral that has been in my tropical tank or this is a bad idea and I should by new one? Should I boil it to sterilize it and be able to reuse it?