Hello BlueTrin,
In order to remove the biters, you need to specify the name of surface (or a list separated by comas). There's also two special keywords you could use as surface name: all
(for all surfaces) and current
(for current surface you are on).
Personally, I've created this to deal with the biter FPS/UPS issues on Nauvis back in the day while playing Space Exploration - my machine just could not handle it :)
Best regards,
Branko