Placing romaine or spinach leaves in the freezer for 30 to 45 minutes prior to feeding softens the membranes making the leaves more palatable.

Freshwater Examples: Most South American, Central American and African cichlids, live-bearers (mollies, platies, and guppies), all goldfish species, many scavengers (plecostemus and algae eaters).

Saltwater Examples: Tangs, angel fish, blennies, sea urchins, and star fish.

Turtles & Reptiles: Many require vegetation in their diet.

Note: Since dietary requirements vary, research the needs of the species you are purchasing.