Mine seems to like it ! i just wiggled a shrimp (deshelled) etc.. infront of him then dropped into his dish , yum yum 8) , and then wanted more !
i assume this is ok being water dragons , they would eat aquatic creatures in the wild :roll:
How large is your pleco , coz they pooh heaps and can clog a filter quite quickly .
i would get rid off that filter cartridge ,and replace with wool /Noodles
each to there own