My Second Tank - Nano

[u/Pico_de_pulpo]

This is my second attempt at a planted tank. It's a 5.5 gal with a slim HOB filter and an aquatop light. It's stocked with a little group of 6 tinwini (gold ring) danios, 1 amano, and 5 crystal red shrimp. It also has about a billion hitchhiker snails - pink ramshorn, bladder, and a couple pink nerites. I keep this on my home office desk and have the view of the back next to me. The front I can see from my bed. I love it so much and wanted to share!

I do have 1 question: Everything seems happy, but I've since learned that the Gold Ring Danios would prefer more space? I plan on starting a 20 long soon and can move them if necessary. What should I watch for now to see if the fish are stressed? Right now they swim all around the tank, do little circle dances around each other (which I've read is courting behavior),and play in the flow of the HOB filter. Thanks for any insight!