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Different species behave somewhat differently. More polygamous species tend to be more intolerant of juveniles in their brood territory than those that are more monogamous (like Blutkehl) or form breeding partnerships (like rositae and Ipiranga).
Most will not eat older fry. The problem is that they (usually the female) try to drive their fry out of their territory (the tank)e when they are ready to breed again. I have 2 tanks where this is occurring right now. Time to break out the bottle traps.
I never had much luck with group spawning, although I rarely had the chance since I use only smaller tanks <55 gallons. Low tanks that will show shadows cast on them is also a poor idea.
You need to make the opening too small for adults (learned that the hard way). I drill an opening in the cap large enough for fry but too small for adults.
It really depends on the bottom dimensions of the tank and the apisto species. Some (a few) species can be relatively safely kept in a 24x12"/60x30cm tank as a trio or breeding pair. Other, more aggressive species, need a much larger tank to be safe.
I have a coffee grinder that I use to grind large pellets (Bug Bites) to finer grain. I even grind it powder-like for smaller juveniles after weaning them off bbs. My philosophy is if fish eat it, whatever it is, then great. But if it is ignored (as is most dry foods by my apistos) then it is a...
I may be wrong but it looks like the post (posterior) operculum is missing on one side of the fish. This isn't uncommon to see on domestic raised fry in less than optimum water conditions. Whether or not it is safe to add to other fish? That is your option. Me? I never put new fish with old...
Considering that there are 20+ macmasteri-subcomplex species found in Colombia, and all fairly similar in appearance, it's hard to ID from these photos. They just don't show diagnostic features found in Schwarzkehl.
... and A. hippolytae is found throughout the middle Amazon. A. rupununi is also found in the upper Rio Branco of Brazl. Neither Guyana nor the upper Rio Branco are hot spots for commercial collectors. I haven't had either species since the 1990s. Both are not really difficult to reproduce in...