A clogged filter will lead to a cloudy fish tank and potentially throw off the water parameters. Gravel is great for aquariums with top-water fish, such as betta fish, tetras, and danios.

All you need is your old fish tank, some pea gravel or fancy stones, and a selection of candles in various sizes and heights. Read more: 25 Easy Decorating Ideas To Transform An Entire Room In A ...