Here is my current setup. I have a 20 gallon long FW
community tank. It is stocked with 4 Harlequin Rasboras, 4 Black Neon Tetras, 1 Honey gourami and 3 Bronze Corydoras. The tank has been up and running for 1 year and the water parameters are fine. I do weekly 25% water changes and regular maintenance( cleaning filters, scraping algae, gravel vac) every 2 weeks.
Would I be stretching it too thin be adding 3 or 4 Glowlight tetras or some other small tetras ? Any advice would be greatly be appreciated.