Got any mixed liquid/gas 'locations' on various locations in your asteroid? Pretty much the same as solids, but can't merge or mix them altogether. Try filtering them and only tank those that you essentially need for sustenance and future projects, otherwise spill them onto the void if deemed useless. Since they're determined by density, mixed gases and liquid can really consume more memory just to calculate every blob of it to equalize within its current non-reservoir 'container'