About Msjinkzd

Invertebrates by Msjinkzd is located in York, PA and is run by Rachel O’Leary. She is a mother of 3, loving wife, and an unmistakable personality at conventions and clubs around the country. A life-long fish keeper, her interests range from microfish to monsters, with a focus on invertebrates and dwarf species. Rachel has spent the last 15 years studying invertebrate husbandry, aquascaping, and breeding practices. Rachel’s fishroom consists of 60-100 tanks ranging from 10 to 220 gallons, and her breeding program includes members of the Corydoradinae group, apistogramma, ancistrus, hypancistrus, pelvicachromis,  as well as various cyprinids and livebearers as well as crabs, snails and shrimp. A passionate educator, Rachel travels to lecture nationally and internationally for Aquarium Clubs and Conventions. She is a frequent contributor to various publications including Amazonas Magazine, The Aquatic Gardener Magazine, as well as producing twice weekly content on her Youtube Channel. She is also the co-author of a book titled The 101 Best Freshwater Species: How to Choose & Keep Hardy, Brilliant, Fascinating Nano Fishes, Plants and Invertebrates.  One of the leading importers of small fish and invertebrates in the US, she works with dozens of dwarf shrimp, crab, fish and snail species,  and is regularly bringing in new and hard to find specimens to make them available within the United States market. She is also passionate about elevating the status of US Aquascapers, and has been diligently working on making quality aquascaping tools, substrates, plants, and hardscape available within our market.


As dedicated to education and community as she is to her fish, Rachel has served as a moderator in several of the largest online aquatic communities.  A member of close to a dozen associations, she can frequently be found at conventions and club meetings around the country. An invited guest, host, and speaker, Rachel loves to share her knowledge and experiences with like-minded enthusiasts. Check out Rachel’s events schedule to see when she’ll be speaking near you.

Rachel’s stock is constantly changing, based on the availability and popularity of various species. The stocklist found here on Msjinkzd.com is updated frequently, and she often accommodates special requests and group buys. If you are looking for a species you don’t see on the list, get in touch via email to discuss availability. To place an order, please send her an email with a list of species you are interested in, the quantity of each, and your zip code. Local aquarists are welcome to pick up orders and visit the fishroom by appointment only. Please send an email to set up a time to visit the Mount Wolf, PA location.

Presentations available:

Choosing Unusual and Interesting Inhabitants for the Planted Aquarium

Freshwater Invertebrates: A Primer for the Devoted Hobbyist

Nano Aquaria: The Ins, Outs and In betweens

Hill Yes! An Introduction to Asian Dwarf Hillstream Species

Freshwater Nano Diversity

Summer Tubbin’- Breeding Fish in Container Gardens