Hello OP - just listing your post in English which is the usual posting language.
Please feel free to post in your language and then add the translated text as well.
Welcome!
Hallo - vermeld gewoon je bericht in het Engels, wat de gebruikelijke berichttaal is.
Plaats gerust in uw taal en voeg dan ook de vertaalde tekst toe.
Welkom!
https://www.google.com/search?q=tran...hrome&ie=UTF-8
Google translator
Hi people I just started holding a salt water container / you are talking about a nano container of 30L of wave with a wave niagara 280 skimmer. I have taken over this container completely rotating and already with live stone Etc. He had been running for 5 months with the previous owner. Well I have some questions and would like some tips for continuing with this great hobby! Firstly, the skimmer in the shadow does not work Well, maybe it works, but I do not produce any foam, secondly, I have read that if you place the outlet of the skimmer slightly above the water surface, your skimmer should work better? Thirdly, can I already start placing coral and a cleanup crew? (there is life in the tank, including and snail / small sea stars / and other small stuff for further tips Etc I like to see reaction
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New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?

Start here - Aquarium Advice Article
https://www.aquariumadvice.com/guide...ater-aquarium/
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves