About two weeks ago i was having some algae growth so I got my FC to shock levels- actually, much higher- they were in the mid 30s at times. Well, I have sparkling clean water, but my FC is still very high (mid 20s) I have not added any bleach in over 2 weeks, and it is hot and sunny here- low 90s. I have a swg that is set at 50% as insurance, and my CYA is close to 70. I would have thought these high levels would have dissipated or burned off by now???