If they do not eat, definitely try Guppies and also Butterworms and nightcrawlers of apt size. These are the favourites of my grandis.
Also check if overall brightness in the tank may be too high. Also they may eat better, if seperated.
I keep my fingers cross, at least they do not look too bad.
Not easy to tell at that age, but I may guess, you have 2,1 from your pics.
I have uploaded a few pics of my pair, one of which may also give you an impression on enclosure size.
Enjoy!

best regards

Ingo

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