Quote:
Originally Posted by Myka
It's best to do 1/4 at a time. Use a siphon hose to suck it out so that any anaerobic areas are removed from the tank without polluting it.
However, with a small tank I would remove all livestock, dump the substrate out, and put the livestock back in. Wait a week, then add new substrate.
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Just thinking a siphon hose probably won't work with crushed coral. I didn't even bother trying with mine, just scooped it out.