Over the last few days my frogspawn has been smaller and not opening near as full as it has been. Today the bottom looks a dark color. I've had it about 9 or 10 months. Only thing different in my tank is I changed to reef crystals instead of instant ocean. Only done 4 gallons of WC with the Reef crystals so far. 40 breeder. SG is 1.025. 0 on Amm, nitrites and nitrates. Calcium is over 500. All is 10.1. Mag is over 1600. Those last three have always been high in my tank and never has been a problem. Any ideas.