that's not necessarily true Bribo. just have to be a bit more careful when talking about smaller tanks (40,55,etc). I have a gold-stripe maroon and a snowflake in my 125, granted it was a nightmare to get them to coexist but they are perfectly fine now. (now im working on getting a yellow tang and purple tang to coexist). to the OP, idk what size tank you have but keep in mind that the Maroons, esp the gold stripes, are one of the biggest and most aggressive clowns available, if you are going to do 2 clowns, make sure they are introduced together. also the engineer goby WILL reach 8-10" in length so be prepared. they are an amazing goby but they look and act more like an eel.