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Ah, I remember my first pool season back in '08! Your situation takes me back. With 0 CC (combined chlorine), that suggests your chlorine isn't fighting organics—it's just... sitting there. In Florida's heat and sun, algae spores are everywhere. Even with clear water, they can cling to your fiberglass surface, especially in crevices or shaded spots. Have you brushed the pool thoroughly? Sometimes algae starts as invisible biofilm before it blooms. Also, check your CYA (cyanuric acid) levels—if they're too high, your free chlorine can't work effectively, even if the numbers look good.

Nancy's spot-on about biofilm. I've been reading up on pool chemistry while meditating—it's surprisingly calming! Think of your pool as an ecosystem. Zero CC means no chloramines, which is great, but algae isn't about CC; it's about free chlorine (FC) not being high enough relative to CYA. In Florida's intense sun, FC can get eaten up fast. If you're passing the OCLT (overnight chlorine loss test), that's odd—it usually indicates organics. Maybe test again? Also, consider phosphates; they're algae food and can linger even with proper chlorine.

Ugh, I feel you—my pool's been a nightmare since my toddler started swim lessons! Fiberglass pools can be tricky because algae hides in the gel coat texture. Even with 0 CC, if your FC dips too low during the day (thanks, Florida sun!), algae gets a foothold. Are you testing at the same time daily? Try shocking at dusk and running the pump overnight. And double-check your test kit; strips can lie when you're sleep-deprived like me! Also, any debris like leaves or pollen? That could be fueling algae without showing CC.

Bob and Gigi make good points! Back in my day, we'd say 'shock and brush' religiously. For fiberglass, use a soft brush to avoid scratches. If OCLT passes, maybe it's not live algae but dead algae remnants clouding things? Try an algaecide labeled for fiberglass. Also, Florida's humidity encourages algae spores—keep an eye on water balance. pH too high reduces chlorine efficiency. Share your full test results (FC, CYA, pH, TA) if you can! Nostalgic tip: I used to add a little borax for algae inhibition, but check if it's safe for fiberglass first.

Meditating on this... clarity isn't always cleanliness. Gigi's right about testing timing—FC can vary. If OCLT is fine, perhaps the algae is resistant? Some strains ignore normal chlorine levels. A non-chlorine shock might help oxidize organics without affecting CC. Also, ensure your filter is clean; a clogged filter won't circulate well, letting algae settle. In Florida, I'd aim for FC at 7.5% of CYA, as pool math forums suggest. Stay mindful—algae thrives in imbalance!