i have a 3ft tank that i was going to set up as marine, and i bought a coral, sand for the subsrate. then i hit a few financial hurdles with the marine plans.
so i made the tank a freshwater tank keeping the coral sand substrate.
the fish lived happily in it
i've since bought a marine setup thats got a crushed coral substrate.
i'm upgrading the frshwater tank to a 4ft and i;ve changed the substrate to gravel,
so i have an empty 3 ft tank with a coral sand substrate and nothing to do with it, can i add it to my existing marine crushed coral? or will that mess with the bioload to much and kill everything? or should i just turf the sand and sell the tank? as i have no need for it.