Our Copepods range from juvenile to adult in size and may be difficult to see with the naked eye upon arrival. This is intentional and it allows you to seed and establish a copepod population in your aquarium. Your fish will eat the adults they can see and the juveniles that they cannot see will make their way into the rocks, macro algae, sponges, etc where they will consume detritus and start to reproduce. If we sold all adults, your fish would likely consume all of them in a few minutes and there would be none leftover to reproduce in your tank. Please research this product before purchasing! Imagine having a sustainable & diverse copepod population in your marine aquarium. Tisbee Pods contains 3,000+ Premium LIVE Tisbe biminiensis Copepods ranging from nauplii to adult sizes. Our genuine quality Copepods are 100% viable to reproduce in marine aquaria and will establish a diverse population of Tisbe copepods in your aquarium. Copepods form a "Copepod Clean Up Crew" in your tank as they naturally keep your aquarium spotless by consuming detritus, fish waste, and other invasive algae. Tisbee Pods is great for seeding new tanks & refugiums, boosting existing Tisbe copepod populations, feeding finicky fish & inverts such as Mandarins, Seahorses, Anthias, Wrasses, SPS, LPS & NPS Corals, Clams, and most other filter-feeding inverts. OUR MISSION is to earn your loyalty and respect while giving you the peace of mind you deserve when it comes to your marine aquarium. We offer genuine quality Tisbe Copepods that are 100% Aquacultured, 100% Sustainable, and 100% Guaranteed, no exceptions!