They like a little bit of a "dirty" tank. Heavily skimmed, low nutrient setups are not a good way to go. Do a search on JenNKerry. They did a lot of research on them, and actually began selling baby colonies. Their claim to fame was pretty much attributed to Roti-Rich, and cyclopeez (it's been a couple of years, hopefully I remembered that right) Anyway, reading that turned me on to RotiRich, and I feed that sparingly in my tank, even though I don't have any gonios (or is that gonii?)
Post some pics!