Vegetables shoud be the main part of the diet, things like cucumber and zucchini/courgette, peas, beans and sweet poatao some fruits can also be used. Many vegetables will normally be accepted but some of the harder ones, like carrots, need to be blanched before using. Some of the softer one need to removed after 24 hours or they start breaking down and fouling the water. Don't feed Pleco wafers/tablets o a regular basis as these are for fish with an omnivore rather than herbivore diet.