Substrate and Media

[JR]

I was wondering since my tanks were down for 2 weeks if I should replace all the substrate. I lost fish in every tank. I know I will have to replace the media in the tanks I set up here. I am going to pick up all my cory this week end. My buddy said he would give me media from his tanks. I dont wont to let my cory get away from me I have a lot of time in them.

[Mugwump]

You can flush the gravel well, and use it, or mix it with new, it should be fine...if in doubt, flush it well with chlorinated water, then add a bottle of peroxide...rinse and use,etc...