I need the skinny on brains! In my tank I have a beautiful open brain that is huge and puffy and beautiful normally. Well not anymore! For the last like 3 weeks it's all squished up and won't expand. I haven't seen any critters picking on it. I have it sitting on a piece of pvc. The parameters are: PH: 8.0 Ammonia: 0-0.25 Nitrites: 0 Nitrates: 5.0-10 (hard to tell) SG: 1.022 Salinity: 29 ppt It is on the bottom of the tank in full light, I would say moderate just due to the depth, and very low flow. I have seen my tang fish slap it a lot! Could that be it? What other information can I provide? Here are before and after pictures.