In the Gothenburg area you have three shops with marine content.
Ciklidhuset Bråtanäsvägen 1 Lerum. He is closing down but I think he still will have some fish and corals.
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Herkules Zoo, Herkulesgatan 34 at Hisingen, near centrum of Gothenburg. They have some saltwater fish and corals. Fish mostly from TMC - UK. Can fix the most hardware you need for your reef
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Företagsakvarium Kraftvägen 2 i Kungsbacka The largest marine shop in the Gothenburg area.
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I would love to help you out (I live 20 km north Gothenburg in Bohus) but for the moment I´m in self isolation (70 +) and can´t meet other people. This will probably end sooner or later and you can contact me through PM
I forgot
Bioted Marine Korsgatan 16 in Kungsbacka. At the moment he only have hardware as I know (but a lot) -
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Sincerely Lasse