Here is Tunze,s website. JL Aquatics sells much of their products and can order any of them. The in tank skimmers, have a water intake that can be closed or partially closed to keep whatever from being skimmed. I believe they have an explanation on their website about such.
http://www.tunze.com/produkte.html?&L=1&C=CA
Of course it totally depends on what type of tank one is trying to maintain, so take all of it for what its worth. I used the 9010 skimmer before. Good skimmer for my in tank purpose but was not . I ordered one of the new Reefpack 200,s for my 30g tank. Not here yet.
My pair of mandarins both ate Ocean Nutrition Formula One Marine pellets. They use to find where they accumulated on the bottom in the tanks current and just pick them up at their leisure, until their little sides use to protrude.
One I purchased from a board member and was eating then and the other I watched in the store when a baby and was eating brine shrimp.
However I did train one also to eat the pellets. I just kept placing them where he was always picking at food. I have seen this also done with smaller type containers that only the mandarin could get in to keep the other fish from eating them.