zucchini and bloodworms are generally good for plecos. i haven't exactly researched the l-83, but based on the diets of most plecos, it sounds like frozen bloodworms, zucchini, and other fresh vegetables such as spinach and carrots could be good supplements. Some driftwood would also be a good idea for rasping and to help aid digestion. another one i've heard of is spirulina sticks... but i don't have any experience with them. pleco's generally grow very quickly. it would be best in your case to research your fish and find out what exactly their needs are and how big it will get.