WOW... Yea, so the biggest I have seen so far is an inch maybe a little bigger, BUT, there are alot. The other day I saw only one crawling up the back wall and rock, it ran an hid from the light. Today light on, I saw at least 4 on one rock, and more on another. I have a dottyback, and was thinking to get a coral banded shrimp or two, but I also have snails and hermit crabs the shirmp might try to eat.