Insaniquarium/YMMV


 * Demonic Spiders:Psychosquid. (aka the Type-P alien) It has very high health, moves faster than all of the aliens, eats multiple fish at once, and after some time, he goes into a defensive mode where he regains health if you shoot him.
 * It Gets Worse when in tank 4, it attacks alongside Balrog.
 * Goddamned Bats: All of the aliens unless you have Blip, since their attacks locations are unpredictable