Hey all, I have a 13 gallon reef tank that has been running for a few months now with no issues. I've had the water tested at the local aquarium shop regularly and there has never been any issues until this weekend. Unfortunatley the local shop is closed for a few days so I can't go in and ask for help in person. From Saturday to today there has been a green algae bloom starting to form on the live rock. One of my two nassarius snails won't bury himself under the sand. Both of my astaea snails have fallen on the sand and needed help getting back on the rock, and lastly my toadstool coral won't open up and turn green during the day. Ph is 8, nitrites 0, nitrates 0, ammonia 0, and the salinity is 1.025. The other tank inhabitants are two clowns and 1 shrimp which do not appear to be in any distress. Any thoughts or suggestions?