Can you put metal decor in aquariums?

It's generally not advisable to put metal decor in aquariums, as metals can corrode over time and release harmful substances into the water, which can be detrimental to aquatic life. If you choose to use metal items, ensure they are made of rust-resistant materials like stainless steel and are specifically designed for aquarium use. Always monitor water quality and the health of your fish. It's safer to opt for decorations made from glass, plastic, or natural materials.