Well if it was this past week, the Monday was a holiday. Plus I'm sure they were bombarded with orders due to their 10% off sale.
They are not the fastest shippers in our hobby, the orders ship out within 2-3 days. But they have some of the most competitive prices around, and that is before their year round 5% off discount. If you absolutely need something to ship the day you order it, order elsewhere. If you do not mind waiting an extra day or two and want to save money, go with AquaCave. I have never had a problem with their timeframe of shipping. Anything that I need immediately, I go to my LFS. Anything I need form online vrey fast, I order from someone that ships faster. The reason I shop online is to save money, get a better selection, and avoid paying taxes to my stupid state.....not because i want fast delivery.