nice! I haven't had any luck getting cichlids to eat veggies accept for vieja/paratheraps species. My giant gourami eats about a head of lettuce a week though and my plecos love zucchini/cucumber.
Romaine lettuce is supposed to be the best nutrution, and iceberg is supposed to be a no no due to some sort of antiherbavore toxin in it ... at least that is what I've read in older books/articles by Dr. Loiselle and Dr. Leibel.