I see benefits for both and have owned both. The best thing about rimless is you have an unobstructed opening thats easy to work on plus looks modern and cleaner
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I can't wait to go rim less n be able to reach my coral my tanks is 12 month old new to hobby love my tank just hard take care of cant wait to tell wife I want another tank even if have to put a cover on it when u have company take it off n enjoy
I don't have a problem with water sloshing out of mine.
Rimless versus trim is completely personal preference like so many things in our hobby.
Any aquarium I install is drilled so the water line is a minimum of 2" below the glass/acrylic edge, rimless or not. This helps prevent splashing and offers some space between the water surface and lid (screen, mesh, glass, etc.) so that when fish jump (not if!) there's an air cushion prior to knocking themselves silly on the top.
If you keep fish of any species, you must keep a top on it. If you do not keep a top on your tank you should not be keeping fish. Fish have already beaten all odds to get into our hands through collection, export, import, wholesale and retail custody, not affording them the best chance of survival by something as simple as implementing a top is inexcusable.