I have a 90 gallon and i have a Kryponite Candy Cane coral that has about 15 heads on it. Now i noticed that tissue is really receding fast from the bottom is this normal as they grow? I know they lose tissue from the bottom as they are growing but i noticed quite a bit of tissue loss in the past 4 or 5 days. temp 78 s.g 1.026 cal 420 alk 8.5 mag 1400tank im sure phosphates are low because i don't really have any algae in my tank. Nitrates are around 1.