Pick between the dwarf gourami and the honeys. Do 3 honey gouramis if you go with them.
Otherwise looks fine.
Wouldn't do a BN pleco in this setup mainly because of bioload.
What sort of corydoras do you have?
All guppies will eat their fry.
Leave the babies in the 2 gallon and keep doing water changes until they're big enough to not be eaten.
But if they all survive you'll be overstocked, which is kind of the issue with livebearers if you don't have a lot of tanks.
I'd just leave the fry with the...
I'd stick with one male two females personally.
I'd say add the green neons, wait a week, add the honeys, then wait two weeks, add 1/2 the kuhlis, then add the rest after another week. But if you're willing to be really watchful of the water quality you could probably add them a bit faster.
Not many permanently. Most that can usually need live food. You could do an invertebrate tank though.
10 gallon you have more options, but I wouldn't do it unless you have a lot of experience in FW before you move to saltwater nanos. Saltwater is a whole other world, let alone a nano...
It is a lot easier to cycle the tank without fish than it is with fish. A lot safer for the fish too. It took me around a month to cycle my 60 gallon. It may take you a bit more or a bit less depending on your water. You can cycle it a bit faster if you have a friend with a bit of used...
I am familiar with Arachnoboards and have reptiles and arthropods myself, so welcome from a fellow keeper of those creatures!
A betta is a great first choice!
In a 5 gallon tank, you will want the betta alone. No other fish.
For a true beginner community tank, you're looking at around 20...