>How simple of a setup does a culture need just an airline like bbs?<
The algae culture can be pretty simple, but there is always the risk of the culture 'crashing' (meaning becoming contaminated) so you should try to keep one flask as clean as possible. I used to use a whole bunch of 2 liter soda bottles lined up in front of a fluorescent light. You just bubble air through them to keep them mixing. Don't bother with airstones, you just need a small piece of ridge airline to get the bubbles to the bottom of the container. You might want to pick up a copy of
Clownfishes: A Guide to Their Captive Care, Breeding, & Natural History
by
Joyce D. Wilkerson
Which discusses how to get cultures started. You can get it used for low $. I used to get my starting algae cultures from Florida Aqua Farms, but local peeps raising clownfish will probably also have cultures going.