Quick update: My meteor shower cyphastrea is developing white spots, and my green birdsnest is getting paler. However, in the last few days, I've been adding water from the main tank and vacuuming out pieces of algal from the quarantine tank. They've got a week to go before they can come out of quarantine so I hope they and the rest make it. I also removed the sponge filter. Thanks for the advice everyone, and I"ll keep you all posted over the next week. Have a nice night.