I run a licensed rescue/foster home for Betta fish and nano aquaria, so I'm sure you know how many beloved fish pass...This item is great for the pet parent who loves to spend a lot of money on their beloved pets, like me! It's high-quality and very well built, and it makes me very happy that it is biodegradable! It really is the thought that counts. In fact, if I'm completely honest, I was surprised when I learned a big pet company would sell something like this, as many pet stores and companies honestly don't really care about our smaller beloved family pets. I'm very glad Chewy is not such a one! Overall, this product is great for a smaller fish, preferably under 4" (not including the tail I run a licensed rescue/foster home for Betta fish and nano aquaria, so I'm sure you know how many beloved fish pass...This item is great for the pet parent who loves to spend a lot of money on their beloved pets, like me! It's high-quality and very well built, and it makes me very happy that it is biodegradable! It really is the thought that counts. In fact, if I'm completely honest, I was surprised when I learned a big pet company would sell something like this, as many pet stores and companies honestly don't really care about our smaller beloved family pets. I'm very glad Chewy is not such a one! Overall, this product is great for a smaller fish, preferably under 4" (not including the tail). Bettas reach about 2.75" without the fins when well taken care of, but, depending on the breed, their fins may be too long, or a very large Giant Betta splendens (5") may be too large. Unfortunately, a Goldfish will not be able to be housed in this either, as they're much too large (they are carp, of course, as many of us already know). The smallest breed of Goldfish get 4-6" (Bubble-Eyed), the largest getting 12-24" (Commons), and many in between. Someone like a Sailfin Molly or Bristlenose Plecostomus may be able to make use of this as well. It all depends on the species, breed, and care the little one got (great or poor care greatly contributes in the total length of a fish, so the better care and bigger tank you provided, the bigger the fish will be, usually). Overall, I recommend this item to *most* people. Not all, per se, as many people don't have the money to buy an expensive fish coffin for every beloved fish that passes, so I do only recommend this to people who are willing to spend more on their beloved companion, even after his/her life ;) … more