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Hi my PH is 7.2, how do I test for the GH

Hi all, I’m trying to do a theme for my tropical fish tank. A dark/goth theme! I’m after creepy, interesting, dark looking fish that’ll happily live together. So far I have a Blind Cave Fish, Black Widow Tetras and Glass Catfish. What other fish could I add in there? Would LOVE a Ghost Knife...