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Heavy-Armored Stalkers: Group in primitive armor-plated tanks like fully grown Alligator Gars or massive Bichirs, bringing an unmistakable living-fossil look to the tank that pairs beautifully with other thick-bodied tankmates. The Megafish Mandate: Large predators feature rapid growth spurts and immense bio-loads. Housing them safely requires extra-wide, large-footprint aquariums, fortified glass, and robust, oversized filtration systems (such as high-volume sumps) to process heavy, high-protein diets.