hi i was playing with all biters types (explosive and also arachnids) with exotic industries, in this modpack seems to be a planet called Gaia, that is 100% peaceful with no biters, i asked the mod owner if the planet is 100% to be no biters, because i was flying in that planet (is only accessible by a portal with a drone) and found only arachnids on that dimension, and i don't know it was supposed to be this, if only they are marked to spawn there, because i haven't found any other hostile type, (worms, biters etc)

Rampant Fixed does not change the rules for placing enemies. It only replaces existing objests with its nests.
Perhaps the Arachnids mod copied the autoplacement settings of the original biters, and then one of your mods prevented standard enemies from appearing in Gaia. But it didn't change the arachnids

Unfortunately, I can't help you

wel talked to you and the guy from exotic industries, i think is something with the aracs mod, gonna tel the moder about it tks