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Perhaps taking things in from the “wild” introduced something that killed your fish?
Could you ask the people that you bought them from have also had unexplained deaths?
Planaria = overfeeding in my experience.
Only ever seen them when I was attempting to grow out six discus. This was despite changing about 25% of the water 3 times a week.
Are you sure that the fish are all pairs and of the same species? Can you post pics?
The tank you posted a picture off is crying out for more cover, such as would to provide some seclusion.
Doesn’t look a good quality fish at all. Its head looks too big for its body. Belly is also sunken.
Do you feed any live or frozen food such as brine shrimp to your fish?
It looks like a domestic form of cacatuoides to me.
Nice one @IanR. What else was in this community tank?
@MacZ - why should the OP separate the parents? There might be a reasonable market for the fish.
I’ve seen plenty of Apistos for sale in shops at less than 4cm. Some of the (Czech?) fish for sale at Maidenhead Aquatics are very small.