I have a bow front tank. There are a couple things you can do to minimize the distortion through the front curved glass although you can’t completely eliminate it. If you place the lens on the glass so it as perpendicular as possible, it makes for a better focused and less distorted shot. Also the closer the coral is to the front of the glass, the better result.
Regardless, curved glass always has distortion. Although I take an occasional through the front glass, I find it preferable to use a top down viewer like avast or buildinganobsession camera tube and simply avoid the curved glass altogether. If I had to do it all over, I’d never get a bowed or curved glass tank because the photography is so compromised.
