The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
You do not want to get this guy. A saddle carpet is quiet a challenging species that I would not recommend to even the more experienced hobbyist. Given your current tank size (30 gal?), it would take almost the whole tank and it would still touch glass.
quick update. I am so glad I didnt take this bugger have anyone here ever seen one of these things grabing a live animal like a hermit crab? It is amazing to watch but luckily it wasn't one of mine.