ok heres some pics of my fuge(dirty), i keep sps, softies, lps, couple diff macros in my display on one side and yes you can keep culerpa without it taking over the display, keep in sand and in low light. my system also has alot of sponges on dark sides of live rock. i also keep 2 bags of chemi pure elite in the fuge, with hermits that keep detris from collecting on the bottom.