Bacillus antiquorum is a Gram-positive, spore-forming bacterium that plays a vital role in pond water treatment. It effectively decomposes organic matter such as uneaten feed, fish waste, and bottom sludge, helping to keep the pond environment clean. By competing for nutrients, it inhibits the growth of harmful algae, while also reducing the risk of toxic gas formation. This creates a healthier and more stable aquatic environment for fish and shrimp.