Meant to update this earlier, but here goes.

After my last, not so nice email to them, I was contacted by someone from Custom Aquatics. I got all kinds of excuses which I could care less for as that's all they were, their excuses. My main concern was getting a response and having things taken care of properly. They apologized and quickly sent out the remainder of my order at no charge. I was even given a coupon to use on a future purchase for my troubles.

The one thing that struck me as odd is they told me they do 95% of their business in person or over the phone so they are not an "E-business". If you go through the trouble and expense to set up an extensive website as they have and take orders online as part of your business, you should have the processes in place to support it. Hopefully my situation was a rarity and this doesn't happen again. They have an extensive inventory of products, much more than other online companies.