Hello, tank is about 2 years old. Mostly LPS, a couple sps. No corals seem bothered and I have great colors but my Hannah checker was pulling .5-.6 phosphates with 3 tests. No algae issues and I have a massive ball of chaeto in the refugium. Should I bother lowering it since nothing seems bothered? Also, shouldn't the chaeto absorb the phosphates? I figured it would be much lower with a volleyball sized chaeto in a 44gal.