I'm just careful when using the magnet near the top. Sometimes a small stream of water may make it out but it's still not enough to go back to a rimmed tank.
I recently torn down my acrylic rimless and replaced it with an oceanic tech. I won't do rimless again. Looks nice, but major pita, especially with acrylic. Plus I wanted to try a wavebox. I just found the extra aggravation wasn't worth it.
Don't get me wrong I love the rimless look but if you're asking because you're trying to make a decision don't forget that the average rimless tank is intended to have a waterline 1.5-2.0" below the top whereas a braced tank can be right to the top.
I'm always a bit curious about people who do the real shallow rimless tanks. If you use sand and go rimless in a sub 20" tank you're really losing a very significant water volume.
Also, if you go rimless it only makes sense to place the tank low enough where you can enjoy the benefits (IE look topdown and just plain be able to notice it's rimless) and I like my tanks at standing height viewing levels.
That said my favorite tank to follow on the Large Tanks Owners forum right now is a very shallow rimless!
Can you really looking into the tank from top? Thought the reflection would be too great. Always like the canopy/furniture look but I must say the rimless is a center piece look. I would think a cleaning or powerehead wave would wake over all the time.
lower the level in the tank so that it doesn't overflow. Or put a small ring of plexiglass around the top to act like a lid so that water doesn't splash out. A lip of a 1/2 inch or smaller might work without taking away from the look.
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