Live rock???
 

I have 120ish pounds of rock in a garbage pail running off the side of a 70 gallon and I'm curious to no if it needs light to do its job like grow pods and other forms of life

Should still function fine for biological filtration and supporting pod colonies, feather dusters etc. Obviously, coraline and other types of algae aren't going to grow.

Would adding a low power nothing special light help with any bio filter stuff is so what could u recommend

Home Depot has phillips daylight CFLs, about 6500K. Grows cheato really well.

Not worried about macros I have another tank for that stuff

No need for light for any biological filtration. Just flow.