Hi Barb, and welcome to the AA forum! I can't really answer your questions about the sump, although I did have one, but so many years ago, I don't remember the details. However, I thought you might get a better response if you put your questions in the saltwater/reef forums. Here's a link to get you to that forum:Saltwater & Reef - Getting Started - Aquarium Advice - Aquarium Forum Community
This forum is basically new member introductions and when you need help and advice there is a variety of different forums you can submit requests for advice, etc. Do you have computer access, or just cellphone internet? If you can access a computer, you can explore all the many options available, and there are so many that it would take months to look at everything. I have found that you can't access many features if you use the app to get to this forum, so when I use my phone, I just google the website (www.aquariumadvice.com
) in order to see the whole site.
Hope that helps.