your salinity is PERFECT.. not too high. Corals prefer a salinity around 1.024-1.026. It is true that your hydrometer may be reading false (they are notorious for being a little wacko!).
Im assuming you havent changed anything recently (flow, lights, etc). It may be just a small period of the frogspawn deflating. Even a healthy specimen will do that from time to time. As long as you dont see A) brown jelly or nasty goo or B) tissue recession where the tentacles meet the 'branch', chances are its going to be fine.
Frogspawns are pretty resilient (I cant seem to kill mine, even though Ive abused it a few times on accident) but some of them are more light loving than others.
I would keep it in medium to high light, medium flow. I keep my lights on the same amount the sun is out during the day (In my opinion you cant get more accurate than nature) and complete the 24 hour cycle by keeping just actinics or lower light 1 hr before light and 2 hours after.
Also, you may have a critter that is bothering it, or a nearby coral that is sweeping tentacles at night. Check out the tank in the evening just to see if there are any suspects, otherwise, frogspawn is pretty easy to diagnose being that if its happy... itll show you! Check your bulbs in your fixture too.. if you happen to have a specimen that is a little light sensitive, it may be unhappy because your bulbs are old
I hope it looks up for you! you could always do an iodine dip just to keep any infection in check!
Good Luck
Jess
