Is This Normal Behavior?

[Axqu]

Hey everyone. New to the forum (happy to be here). On December 31st I got a new Acf. It's been a wonderful experience so far. She's growing well (nearly tripled her size since I got her), eating well, and seems happy in her enclosure. She explores, and has regular resting spots. I know acf are air breathers and surface to get air but my girl likes to just hang out at the water line. Is that normal?
Attachment 81565

Apologies for being so late to the game. First of all, that is WAY too much salt. Salt doesn't evaporate with the water, so even marine fishkeepers top off with fresh water and don't add salt unless they're doing a water change. Second of all, please tell me that tap water is treated with dechlorinator. Thirdly, ACFs are best housed alone; they're highly predatory of anything smaller than they are, and they tend to get harassed and nipped by fish they can't eat. Certain armored catfish even have spines-- not good for frogs. Also, a 10 gallon is good for an ACF alone, but that tank is way more overstocked than I would run it.

As for behavior, floating at the surface is totally normal and fine for ACFs as long as they're not showing other signs of distress. My girls like to either hang out on the bottom or float with their little noses poking out. Totally normal.