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Phosphate is one of those parameters that quietly decides whether your reef looks sharp or hazy. Too much and you get hair algae carpets and dull, brownish coral tissue. Too little and some SPS colonies bleach out or stall growth. Granular ferric oxide, usually shortened to GFO, and other iron or aluminium based media are the standard tools for keeping phosphate in a useful middle ground without swinging it to zero.What does GFO actually remove, and why does coral colour change?GFO and similar media bind orthophosphate (PO4) onto iron oxide or aluminium oxide granules through adsorption. As phosphate drops, nuisance...

A frag is only as stable as what it's glued to. Ceramic tiles and plugs give coral tissue a hard, inert surface to bond onto, and choosing the right shape for the coral you're cutting makes the difference between a frag that heals cleanly and one that keeps sliding off its base for weeks.Why ceramic over plasticCeramic is porous, pH neutral, and heavy enough to sit still in moderate flow without a plug stand. Coralline algae and encrusting tissue grip fired clay far better than they grip smooth plastic, so tiles tend to look established faster and hold frags more...