If spiders cant find food in a large tank, how do they survive in the large tank called the wild?

thats not what i ment.
oviasly they will survive, thats logic.
i just ment, some will be more fed then others,
like what happens with mine,
ive got a communial with 20 H.incei and i feed 30 pin heads at a time and still some dont get fed.

Survival of the fittest.

Ok, so now I am even more confused.

What size enclosure should I house my 7 H. Incei that is about 2.5cm in, I am leaning towards 200 x 200 x 300 for now.

Size of the enclosure does play a role in my experience, keeping say 10 H.incei that are 1.5 or 2cm leg span in an enclosure about 15 x 15 is fine because they are always in close proximity of each other and they learn to tolerate each other being around. If the tank is too large and they only encounter each other rarely, the chance of an encounter turning into a lite lunch may happen more easily.

@Chabendiv, you could place all 7 of those H.incei into a 15 x 15cm tank for now and they will web the heck out of it. A 30cm x 20cm tank would also work very well but might be too big for them right now. That's what ME thinks anyway