After stocking our 3/4 acre tank about 18 months ago, caught my first fish... been fishing it for about 6 months with no action till now.

...Unfortunately it was a huge shiner, of which we caught 4 more. All large.

Should this concern me?

I started the pond off with shiners, fatheads, blue gills, redears and catfish. Added LMB fingerlings about 3 months ago.

I figured by now I'd have bites from brim or catfish. Concerned that the shiners are growing so large.. maybe I've lost the higher food chain fish?

Any thoughts?