i would look at why you are getting algae, instead of trying to put a band-aid on it.
What are your nutrient levels?
What are you doing to export nutrients? (Skimmer, water changes, chemicals, etc...)
Age of bulbs?
Feeding habits?
Once you determine these factors, and start correcting for them, the algae should subside. I would imagine that the new fish would only add to your problem by increasing your bio-load.
HTH,