thanks for the reactions.
if people want to discus on the mixing thing in tanks yeah do it in the treats started for it. it's my tank and it's my choice witch frogs i'll put in there.
now on the question about the tubing. normally it's not possible to get something stuck in the tubing. there's a seperated room for the waterpump in the viv. also the waterpump is completly surrounded by filtermaterial so i don't worry about getting something in the tube.
if it happends i'm scr*wed and it will be a tank without a stream.
today i went to a local orchid breeder and got me some nice peruvian specimens.
here some pics
i didn't like the left side much before, not enough plants, this is the left side now after the planting