not saying this is surely the case- but Kellogi don't have a good reputation. They tend to be primarily raised for the chinese medicine trade, and have problems with parasites and disease. They're raised in crowded pens in the sea- essentially floating mesh cages, they're not bred in a closed system. They're certainly the cheapest seahorse available, and word is you get what you pay for. The also grow to be the amongst the largest of the seahorses- they ultimately need larger aquariums than most other seahorses. They're also supposed to do better in a temperate water system- they are from tropical areas in Asia, but they're a deepwater species, and require lower temperatures and lighting. To Petco's credit, their website (from which you can also buy this species) does say they get larger and so recommends a larger tank size, and does recommend they be kept in a species only tank. I'm interested to eventually try them because I'd like to have huge seahorses. I currently keep H. Erectus, widely considered the easiest/hardiest to keep.