I have a mandarin in my 24 gallon tank....i have 30 pounds of live rock.....it seems happy and is eatin pods mysis,brine ( both garliqued) and some pellets....i am starting a fuge for it and was thinkin puttin a mantis shrimp (G.Smithii) in there ....ive heard that they wont eat pods unless they are 1/2",,,or that the mantis is small...what should i do??