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By the looks of them, they seem delicate but they can stand more than most think. Angelfish are freshwater fish but they are used to a certain environment in the Amazon. They like soft water with a lower than neutral pH (acidic). Ideally, they like to live with live plants. They provide more oxygen and help clean the environment. You’ll have to be careful with the ammonia levels in the water since these fish like to at a minimum. This means having a good filtration system to keep the levels low. https://kamiworldwide.co.uk/ Feeding your fish is the next step. Angelfish will eat pellets and flakes but like a little variation in their diet as well. Throw in a bloodworm or two from time to time and some brine shrimp to mix things up.