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Eheim sells some very good suction cups. They are black so they look good and they hold up over time better than any other suction I have ever used. They come in multiple sizes, one fits air tubing.
Cheers folk I went to the usual place u get my supplies (not fish) and I asked the girl that works there and she looked at me like I was stupid. Lol. Don't fancy the silicone route. A look on the tinterweb tomorrow. Cheers again