in addition to the UV, the plants

put in a bucket filter
http://weloveteaching.com/puregold/c...re.html#BUCKET
forget the gravel, just use polyester batting (walmart, no additives,
not fireproof).
you can use the pump you are using or another one. the idea is to
drag that algae into the filter material and then toss the batting to
get rid of the nutrients by tossing it out. it wont take long to trap
the algae. Ingrid