substrate for geos and jurupari

[halconGT]

Hi to @ll, I'm migrating to 75g project. My stock are 4x geos steindachneri and 1x satanoperca jurupari. I only have volcanic sand for substrate. I read volcanic sand is good for geos, but my trouble is about size for granules, It isn't sand else is 2 mm little stone. Is sure this substrate for eartheater?

Thanks