Bio media selections?

You don't need any. If you do get some, seachem matrix, a biosponge, or ceramic rings are the best for something that won't simply fall apart.
 
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Best bio media for sump. Don’t want something that’s going to turn to mush.
If you add anything add real live rubble rocks from something like Tampa Bay Salt Water
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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