@Peter. Things are much more clear now. Will write a mail to the distribution-address, will make things much easier.
@PatrickG. Thank you for the list and advice. It´s very helpfull. When I have my filter in use, I will make a piece foam/sponge on the intake of the filter.
@Günter Oberjatzas. Thank you for this great info. After reading your post, I can conclude that there is no
Cryptocoryne that we know of, that can be held submersed in our tanks and comes out of the direct habitat of paros. This is all what I just wanted to know.