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In my 20 long tank (gallons), I have 2 bristlenose plecos, 6 emerald eyed rasboras, and 6 bronze cories, not to mention a ton of MTS.

Two questions: how much food is TOO much for my plecos? There's little to no algae in the tank right now, so I usually give them one algae disc a night. Yesterday I tossed in an inch long piece of lettuce--which was eaten promptly. I added another piece of similar size today, and replaced it with a two inch one tonight (after the male demolished the piece).

Am I not feeding them enough, or too much?

Next q: if my bristlenose breed, will the male defend the eggs from MTS?

That doesn't sound like too much. The fish cannot digest plant material all that well anyway, so it should pass through the GI tract fairly quickly.

You know, the word on how much to feed is almost always "as much as the fish will eat in 5 minutes." I try to follow this advice with most of my fish, but not my plecos (a gibby and two ancistrus sp.). I usually toss in about 3-5 algae wafers a night. There's always something left on the bottom after 5 minutes. However, I guess I've got the attitude that as long as it's gone by morning it's okay.

Ha, I've this rule for my plecs:

I feed your in the morning, make sure I don't see any leftover that evening. I feed you at night, make sure you finish everything the next morning. Otherwise, I'll give you a tablet less, during the next feed.

Yeah, I think it doesn't really work on 'finish in 5 minutes' for plecs, especially when most of mine only comes out to eat when no one's around.

In my opinion it is really your judgement on how much your guys eat, kinda play with it and if you find you are overfeeding remove the extra food.
maybe try 2 algae wafers a night and if you see any leftovers try 1 and 1/2 same with the veggies.
Connie