Why are my corals losing polyps?

[TankWarrior]

Noticed my Zoanthids and Acros are losing polyps over the past week. Water params are good, 0 ammonia, 0 nitrite, 5 nitrate, 8.2 pH, 1.025 salinity. Running a 75g with Radion XR15s, 10% weekly water changes. Any ideas what's messing with them?

[dream9]

That's weird, my tank's been chill but I've heard sudden light changes can stress them out. Did you tweak the Radions recently?

[sakurana]

Could be a flow issue too. My Acros acted sketchy when my powerhead died last month. What's your current setup like?

[briarfox]

Noticed my Zoanthids and Acros are losing polyps over the past week. Water params are good, 0 ammonia, 0 nitrite, 5 nitrate, 8.2 pH, 1.025 salinity. Running a 75g with Radion XR15s, 10% weekly water changes. Any ideas what's messing with them?

Those numbers look solid, but how's your alkalinity? Swings there can nuke polyps faster than you'd think.

[onyxer]

Seconding the alk check. Also, any new tankmates? My clownfish went rogue and nipped at my Zoas once.

[nirvo_1]

yo, my dude, check for pests. flatworms or nudis gonna wreck shop if they sneak in.

[TankWarrior]

Thanks for the tips. Alk's at 8 dKH, stable for months. No new fish, but I'll inspect for pests tonight.

[briarfox]

yo, my dude, check for pests. flatworms or nudis gonna wreck shop if they sneak in.

Good call. A dip might cut it if you spot anything sus.

[sakurana]

If it's not pests or params, maybe test for stray voltage. Had a heater leak current once that made everything sulk.

[dream9]

Could be a flow issue too. My Acros acted sketchy when my powerhead died last month. What's your current setup like?

Yeah, my SPS hated when I switched pumps. They perked up after a week though.