I think NLS pellets are ok since they are more for the L25 and L114 than the L330. For the L330, you should really throw in some zuchinni or other veggies (see PC link below). I'm guessing that it will really appreciate them as it probably won't have to compete with the L25 or L114 for the veggies (reportedly, L114s enjoy carrots, but mine don't touch it; the only "veggies" they've touched are the coconut husk fibers that they've eaten).
nice pick ups.
the watermelon will be fine with most foods, but you'll just have to watch that he doesn't get too much meaty protein, so long as you offer veg and algae wafers regularly, he should get enough variety
just starting a pleco and CL tank so far i have a royal, green phantom, vampire, three beacon, L202, clown plec, gold spot, a common and an albino common.