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My Acropora started showing RTN overnight. Parameters are stable, 8.1 dKH, 420 Ca, 1350 Mg, 0.03 PO4, 5 NO3. Running a Red Sea Reefer 350 with Radion XR15s. Any quick fixes before it spreads?

Cut the affected branches at least an inch above the necrosis. Dip the frags in Revive or CoralRx, then glue them to fresh plugs. Check flow, sometimes dead spots trigger RTN. What's your alk swing like?

florapine wrote: ↑Wed May 28, 2025 6:15 am My Acropora started showing RTN overnight. Parameters are stable, 8.1 dKH, 420 Ca, 1350 Mg, 0.03 PO4, 5 NO3. Running a Red Sea Reefer 350 with Radion XR15s. Any quick fixes before it spreads?

Had the same issue last month. Bumped my water changes to 20% weekly and added extra carbon. Stopped the spread in my tank.

yo, alk swings are sketchy. my monti got wrecked cuz i was lazy with dosing. u gotta keep it tight, no more than 0.5 dkh fluctuation. test daily till it chills.

Sorry to hear about your Acropora. I've found that reducing light intensity by 20% for a few days helps stressed corals. Also, double-check your salinity with a calibrated refractometer. Small things add up.

dunno bout all that chem stuff but my lfs told me to toss in some microbacter7. worked for my birdsnest. might just be luck tho.

RTN is often bacterial. Try a broad-spectrum antibiotic like erythromycin in a quarantine tank. Dose at 250mg per 10 gallons for 5 days. Monitor closely.

Thanks for the tips. Cut the bad bits and dipped like Kalixar said. Alk was steady at 8.1 for weeks, but I'll test twice daily now. Gonna reduce lights too.

reef_lord9 wrote: ↑Wed May 28, 2025 1:15 pm dunno bout all that chem stuff but my lfs told me to toss in some microbacter7. worked for my birdsnest. might just be luck tho.

microbacter is legit, but it's more for biofilm. won't stop rtn if your alk's whack.

my tank's too new for sps but following this thread. good luck op.