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Unfortunately I've heard all that has been stated but in the 70's and early 90's it was ignorance and millions of fish in the home aquarium trade suffered and died prematurely. Now in this day and time stupidity on us if we don't do research.
My trick to catch synos or raphaels: remove all decor from the tank and put a cup or likewise object in the tank. 5 minutes later you'll have all the hidey catfish in the tank in it.A trick I used with my Syno catfishes was to lower the water and slide a small plate underneath then lift them up.