Not that it has anything to do with your question, but if I'm reading your post right you added salt to the tank to bring the SG
1.018 up to 1.024? A couple comments if I read that right...
A big sudden salinity swing like that is not going to make your critters very happy. A gradual change is salinity would've been better, maybe a point or two at the most per day. Especially in the "up" direction.
Also, adding salt directly to a tank is not normally a good thing. Newly mixed salt water takes a while to stability pH/salinity and mixing it up external to your tank is the best thing you can do. Then give it 24 hours or so to settle down.
The sudden change in salinity, along with the possible big shift in pH from mixing the salt in the tank, could lead to some illnesses in your critters from the shock/stress. Just keep an eye on them in the next week or so.