what fish do I get?

[user123]

I have a 20 gallon long tank with one platy, one female betta, and a rubber lip pleco - I don’t know if this is a strange combo but they all seem to be doing fine

I want to add some more but I have been finding mixed options online about how many fish can go in a tank this size and just want to be sure

what else/how many can I add? I was thinking maybe some tetras but I don’t want to overstock

I am fairly new to this so I appreciate any help I can get

 

[itiwhetu]

Water parameters are the key here. What are they? Why did you end up with these three fish?

 

[user123]

Water parameters are the key here. What are they? Why did you end up with these three fish?

The temp stays at 77° I don’t know all the others numbers off the top of my head but I could go test then

I have had the platy for over a year and I recently upgraded from a 5 to the 20, as for the betta a new store opened and I just wanted it I guess, and my friend was trying to get rid of their tank and just had the one pleco left so she gave it to me