My name is Chetan and I was gifted a 10 gallon aquarium recently. With this aquarium came 4 neon tetras and 4 harlequin rasbora. This was before I understood anything about fish which in turn led to all of their deaths. After days of research I learned about the nitrogen cycle in depth, and what fish to purchase. I’m going to grab some used filter media from a mom and pop store, then I will give it a week to run while adding fish food at set intervals daily. Once I test the tank and get satisfying results I was planning on starting a community tank. The topic of overstocking is a gray area among fish enthusiasts which is why I would like to ask people who have more knowledge than me. As of now I am planning on purchasing 1 neon dwarf gourami, 3 albino corydora catfish and 5-6 harlequin rasbora. The temperature is constant at 80 F and the filter can do 90 gallons an hour. It is also a non-planted tank. I am willing to do as many water changes necessary, I would just like to know if this was enough space to not get fish stressed and let them live somewhat comfortably. Thank you for your time, and I hope you have a great rest of the day!