Are there any to justify the increased cost or is it pure aesthetics?
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DOH . I forgot that I looked around today with a buddy and we were pricing tanks . We saw two 150's 48w x 30d x 24h and the price difference between regular framed and rimless was about 50.00 . Both of these were not low iron/starfire glass which a another cost factor to consider as mentioned a few times. YMMV between tank builders .
All in all rimless imho is a nice look but you also have to make a screen cover to keep the live stock from carpet surfing . That is one negative of rimless I can say is a con .
Are there any to justify the increased cost or is it pure aesthetics?
Obviously not. It just looks better and more modern. People pay for that. :)
It's not going to make your corals grow faster.
Now if you have a canopy then you obviously wouldn't go with a rimless tank.
Lol you can still do a canopy just float it above the tank it helps from the light bleeding into the room so much