Looks like you have representatives from all continents and
significant lakes in the Cichlid groups and then the dollar and the
loach. That is going to be a very difficult combination to keep
happy especially if anything tries to breed...doesn't matter if
they are the same sex they will still cause the same fuss.

I don't think the Clown Loaches will last very long but...they will
hide in anything eg filter inlet pipes, fine gravel...anywhere...I
have had them reappear after several weeks

Suggest live food and maybe look with red light without the
aquarium/room lights and see if they appear if not...suggest you
don't replace them. The dollar will be OK if it is big enough

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