My GT use to chow on spiders all the time.
I threw in a wolf/brown house spider in & the spider went all "deep sea diver" on me. Turned a slight sliver color & was walking around on my rocks for a good 10 mins.
My GT just watched it for awhile & then pounced on him.
The spider was probably around 2"-3" in diameter TL.

The GT was 10X bigger.
One of my juvi Texacons, tried to chow down a bee that fell into the tank.
The bee ended up stinging him on the lip.
I netted him removed the stinger, nursed him back.
He mos def showed signs of the venom, his slime coat was peeling, & his fins fray on the ends.
He healed fine except he has a red/dark spot where he was stung.
I feed my guys earth worms after a good rain(from my grass).
I soak them over night in a bucket of water & gut them.
No ferts in my lawn except what comes out of the dogs.
BTW:
Daddy long legs do produce highly toxic venom, however their fangs are far too small too penetrate human skin.
The venom is their primary weapon when they hunt their prey. They won't bother trying to bite something they can't eat, no use in wasting venom.