+1
11 gallons is great. Just make sure any filtration you use doesn't flow too fast
In a 11 gallon one of these is perfect, I use one of these in my 18 gallon.
http/www.ebay.com.au/itm/XY-2822-Large-Aquarium-Shrimp-Fish-Tank-Double-Biological-Sponge-Bio-Filter-/201586760681?hash=item2eef81dbe9:g:7ekAAOSwcvdXO91g
This is it in action.
https/www.youtube.com/watch?v=KnVMdUus8ok