So, we all know this hobby is expensive. It can be more or less so depending on what you want, but either way, it ends up costing quite a bit and most of us probably knew that before even getting into it. I am wondering, whats something that ended up cost much more that you had thought it would? for me, it was plumbing. I knew things like a skimmer, ATS, nice sump etc were going to cost me, but I always left the plumbing as an after thought. something I could pick up quick once I had all of the major parts. well, I just put in an order for $550 to plumb the damn thing and I am "sticker shocked"