New to the site - My 5.5 Gal Nano

[Coincidentally]

I was looking at the red coral gobies last night at J & L's they were soo tiny. I actually went there for a couple of yellow or green gobies but they had none for sale

I want to do a nano have started cycling a 10 gal but do not know where to go with it yet. There is a snail and a crab and all macro algae I keep taking out of my other tanks so far.