The reef is not rimless but does have a 10 inch all glass Trim around it with a 2 foot piece in the middle. There's 2 3 by 3 openings in it. It's to tall to be rimless, being it's 48 inch tall and just 3/4 plate glass and silicone. That all thats holding that tank together. Scary lol You don't see it and it's hard to see it but there's over 20 pieces of glass supports. I'll post some pics of another similar I've done. The 500 could be rimless but because of its location it would make a salt creep mess, so its not. So I put a top on it.
went back through the thread drooling and noticed... are the huge tank and 500g rimless?!?! duuuuuuuuuude (envy)