Dead coral to use?

[Julio0207]

Hey guys
Need help linda new to hobby new on this dont know if i can use. Dead coral i believe as bio media in my three aquariums the 75 just made some kind of trickle filter and the other 2 they gonna be hang on back sump

[Delapool]

Hi, did you get this sorted?

[54seaweed]

you can but I would also use some rock rubble with it , most dead coral skeletons I use as filler in rock scape it adds character , I also keep a bunch down in the sump that I sometimes attach frags too