Raising two small groups of Pearl Danio youngsters within a short space of each other to at least 4cm TL, desperately wanting to give them more space than the 60x30x30cm Korall60 that the parents had been put in as quarntine after some developed mystrious pimples on their lower mouth, by which time my Lionhead Cichlid bonded pair were raising their first brood and hell in the Rio240.
I decided they had grown enough to introduce them all to the garage 5x2x2, which was already occupied by everything that had been evacuated from the Rio240. Overnight, at least six Pearls vanished (in hindsight, eaten by either my ~7cm Barilius; ~7cm Humphead Glassfish; my two adult ~11cm Opsarius)... Most of the survivors almost ran into the net, absolutely terrified on the water surface, when I then spotted a youngster hyperventilating under some bogwood who also darted into the net.
So back to the Korall60 they went, a couple recovered from injuries, by which time the Lionhead fry were growing quickly and not being guarded that much by the parents. Given the fry were now too big to be eaten by the Pearls, I decided to add them to the Rio240, thinking they would make good dithers for the Lionhead family. Gave them the standard drip acclimitisation over ~45mins, netted them over and hell broke lose within seconds... The Pearls seemed really unsettled from the first second they went in, as if they were still traumatised by the 5x2x2 experience a month earlier, going randomly around the tank at lightspeed. At least a couple more perished before I got chance to rescue them again, not sure if one was chased up the integrated Juwel chamber and into the pump (more likely) or it was bitten in half by one of the Lionhead parents.
All in all, two horrible lessons learnt: Fish will eat other fish that fir in their surprsingly large mouth, cichlid parents are like the devil incarnate in order to protect their fry at all costs.The few survivors of the two ordeals were rehomed with "mussels" from this forum, living in a luxory peaceful pad 6-footer, absolute bliss for the Pearls I'm sure.