am i underfeeding?

hi some background first

i got a 21 rtg,
6 x bp, 4"
5 or IT smallest 4" biggest 5 or 6"
1 x 8" endi

i been feeding rtg with 1 or 2 bullfrogs, 1 day 1 time, and sometimes 2 days feed once.

bp diet, some tetra bits

and mp, about 5 pieces, cut up, eaten by IT, RTG, bp, 8" endi

they always look hungry.

due to that i once had ammonia spike, i am afraid of overfeeding.
since then i monitor the water parameters, now rtg eating well, and is much robust now same goes to IT.

but the question is am i feeding adequet? rtg always seem hungry.
though good appetite sounds like good news. but wanna check if i am underfeeding.

but i know rtg will start to spit food out means its full..

[Shawnsp]

Keeping the aro hungry or half feed is a better option then over feeding.

2 BF a feed , one two day. You may consider feeding more since your fish is 21"