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I think being a smaller closer knit group you tend to have a bigger hit when a half dozen forum members are gone. Think the swap after the summer is done is good because it drags people back in.
I have had angels coral beauties and Atlantic pygmy and while they tasted everything they never did any harm. They just go around picking everything. I feed well.
You can buy another clown....if the jumper was the smaller one make sure you buy a small one. The main thing you want to do is not have two females. The larger fish will turn into a female and be the dominate one. Pretty neat stuff would suggest reading up on it. But generally not hard to...
Make sure the ATO tube is in the tank...not just pushing water all over the floor? Hope you figure things out. Strange that the salinity is OK while the ATO is empty and water is everywhere...to me that means the water on the floor was from the ATO.
Frogspawn is part of the Euphyllia family, also hammers etc. You can put them close to each other. You don't want them in contact with SPS for sure and they can fight with other LPS also. You maybe somewhat surprised at how far their sweeper tentacles can reach. You want Cyanoacrylate based...
You can put another membrane than the one you started with. I have had 50,75,100 with restrictor in my Coralvue RODI that came with a 50GPD to start. Works the same unless you have some issue with water pressure.