Try metro flakes - or if you want try soaking their food in epsom salt. But ultimately is sounds like your fish has a parasite in its stomach which is very common but not always the easiest to cure but not impossible by any means.
The second thing is apistos don't have long life's especially albino's.
I was lazy and ordered some NLS Hex Shield that I give when ever I get wild fish in or fish with sunken stomachs.
Are you looking to be involved or commited
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My apisto c which is albino. Has been pooping white stringy things. Added meds and water change every two days for a week nothing has change. Water is fine. Had him for 3 months .
He's super skinny and stays at the bottom of the tank.
Only swims when it's feeding time but it looks like a lot of effort o. His end to swim to eat