30l tank

Hey guys, I've had my Betta and three Cory's co-existing for the last 3 or so months now and they are doing pretty well. Quite recently, i've been seeing a lot of youtube videos with Red Cherry Shrimps. So, my question for you guys is would you recommened adding some shrimps to my 30L tank...

Not sure if this is an emergency yet, but would appreciate someone else's opinion before I head off to work at 12.30! Yesterday I got a male plakat betta in my newly cycled 30L tank. No problem there - he seems to be settling in slowly.   About ½hr ago I noticed in the 60L tank that there was a...