So far so good. It's been running like this for a few days and I haven't had my hands in the tank at all. The sand however has moved a little bit on the edges because I moved the wavy sea closer to the end of the tank. I siliconed a piece of glass to use as the wavysea bracket, which raised the wavy sea a little bit. Here's a picture - I wanted the wavy as far left as possible, but as you can see it can't go any lower:
So I couldn't put a 90 degree fitting because it was just a tiny bit too high which drew bubbles from the water surface, so I ended up putting a 45" elbow on the end of the wavy sea which points it too far down toward the sand, so it gradually moved the sand a bit exposing some of the glass bottom. The solution to this is I've ordered an omni flex nozzle from Oceans Motions. It's sort of like a 2 section locline but in full 1", that way I can adjust it so that it's not facing down like the 45 elbow, or too close to the water's surface like the 90 elbow.
