about feeding the fish, I am not too sure how big they are and how much food you give them, it might not be enough for them, but look on this website
http://www.oscarfish.com/index.php?s...5fc0784415f4af
in the forum section General Freshwater advice
they will really give you more advice, then I can
And what your pleco has is probably a common problem ich, or ick (not sure how it's spelled, everyone spells it differently) but what you can do is ask them about it or just do a search on that website and it will give a lot of previous topics on ick as i already mentioned it's very common it's a parasite