I've read over this thread and there many things that folks are touching upon, but to sum it all up it works like this:
Apex connects to the Apex Fusion servers via an outbound connection. Just like you on your computer going to a website. Only in the most restrictive environments would that connection be blocked by a router. I've seen it, but that is typically found in more corporate environments that monitors or restricts the websites their employees access.
I will echo what
@Fritzhamer has said here. If the Apex connects fine hardwired and does not connect via a 3rd party wireless device, then likely the issue is with that 3rd party wireless device.
The most common issue with 3rd party devices is they don't forward the client's (in this case the Apex) information appropriately to the router. I have observed a couple of different things happen in that regards, the first is the Apex and the 3rd party wireless device both show up in the router table as one device- not two separate devices. This can cause IP conflicts and such. The second is the 3rd party device works like little mini-router itself but does not pass on the appropriate network information from the router to the Apex. This may cause the Apex's default gateway and/or DNS server addresses to incorrect and not connect to Fusion. The finalyl (and less likely) issue could be this router has registered the Apex as an Ethernet client (because it was originally connected that way) buts now it's coming in under a wireless MAC address, and, well, the router doesn’t like much either…
There are ways to get around all of these issues, but they take a bit of network knowledge. Not to get into how to do this, because every router is different, but essentially the solution is turn DCHP off in the Apex or the 3rd party device, then make a DHCP reservation in the router to make sure there are not future IP address conflicts.
Do I recommend any of this? No. If you cannot connect wired, then I recommend taking a look at power over ethernet adapter. These essentially use the power lines in the house as an ethernet cable. One small box will plug into a wall outlet at your router and another small box will plug into a wall outlet at your Apex/aquarium. You then connect an Ethernet cable from each of the small boxes to the router and the Apex. It essentially makes the Apex hardwired to your network and things like firmware updates could even be done (but hardwired is still better). I would recommend these over a wireless adapter 10 out of 10 times. The other option is to look at upgrading to an Apex. They have wireless built in and can be connect via hard-wire or wireless or both.
@Aaronhome27 , thanks for working with our support team to help you work through your support ticket this today.
-Paul