Agardh, J.G. (1887). Till algernes systematik. Nya bidrag. (Femte afdelningen.). Acta Universitatis Lundensis 23(2): 1-174, 5 plates.
1. What IS that thing? Answer: Ventricaria ventricosa, previously known as Valonia ventricosa. Common names: bubble algae, sailor's eyeballs, sea pearls.
2. What biological agent might you use to control them in your salt water aquarium? Answer: You might try using a crab in your tank to eat up the bubble algae.
3. (Extra credit) Why does it now seem that the use of this biological agent might be a really bad idea?
Search lessons: There are a couple of things to note here.
1. Keyword choice: Try to use terms that you think someone else would use. If it's not working for you, ask someone else for the words they would use to describe it.
2. Wikipedia as a starting point: As we've discussed, Wikipedia is a great place to start your research on a topic, but don't think of it as the ending point. In this article, Wikipedia has dead links (easily fixable), and uses outdated names in the article.
3. Triangulate what you find: Look for multiple sources to get the same data in different ways. I used Scholar to find that article about emerald crabs, and I found AlgaeBase as a great authoritative source for the latest on algae from a botanical perspective.
(1) Olsen, J.L. & West, J.A. (1988)."Ventricaria (Siphonocladales-Cladophorales complex, Chlorophyta), a new genus for Valonia ventricosa." Phycologia 27: 103-108.
(2)Figueiredo, Joana, et al. "Efficiency of using emerald crabs Mithraculus sculptus to control bubble alga Ventricaria ventricosa (syn. Valonia ventricosa) in aquaria habitats." Journal of the Marine Biological Association of the UK88.01 (2008): 95-101.