Ideal for bottom dwelling fish such as plecostomus, loaches, catfish, shrimp and more. Aqueon Rounds sink and dissolve more slowly to continuously provide food that accommodates bottom-feeder’s typical eating habits. Aqueon Algae Rounds contain natural vegetable sources, such as spirulina and kelp, which algae eaters prefer. If necessary, break rounds into pieces to prevent overfeeding. Satisfaction Guarantee.