African Cichlid to saltwater conversion

[RxeefeRx]

hi everyone,

I was going to do a second African cichlids tank but Now I changed my mind and want to do saltwater. I have cycled the tank but didn’t add any fish. I currently have a CaribSea reef type substrate. My question is am I able to reuse the substrate and what do I need to do to make it safe for saltwater?

 

[James M]

Was the substrate used in freshwater tank with fish?