Here is a list of some suitable food sources for plecos: *I have not including the many types of sinking pellets and flake food, because although a useful addition I dont believe them to be as useful as fresh or frozen foods such as those below and would never use them as a main diet, but merely supplement.
Meat/Protein based foods
Worms- bloodworms, blackworms, nightcrawlers etc (a side note, i've never had a young carnivorous plec refuse bloodworms)
Mysis
Beefheart
Prawn
Shellfish- mussels, cockles etc
Squid
Silversides
Spirulina
Brine Shrimp
Crustaceans
Other Insect Larvae
Fish Eggs
Krill
Daphnia
Chicken Liver
Vegetables (remember to wash all veggies of unwanted bugs and blanching veggetables isn't necessary- it takes away nutrients)
Cucumber
Zucchini
Potatoes (I would soak these for a long time and wash thoroughly as they contain a lot of starch that is bad for water quality, although otherwise a great food source)
Sweet Potatoes
Shelled Peas
Broccoli
Carrots
Lettuces
Cabbage
Courgette
Yams
Parsnips
Squash
Suede
Spinach
Beans
Others
Melon
Bogwood
Mango
Apple
Kiwi
Rotting Leaves (or live)
Please add any feeding tips or techniques here to help squash the myth of “plecos eat algae”. Cheers
WyldFya Don't forget pumpkin! My plecs went NUTS over pumpkin.