Snail-Proof Intake Guard for Rear-Filter Aquariums

A box-shaped grille that is siliconed over the corner opening into a rear filter chamber. If a snail parks on one face, the other faces keep passing water. Rear-filter and all-in-one tanks draw water through an opening in the divider glass. A flat grille over that opening is easy for one adult apple snail to block. This guard is a box instead: three grille faces (front, side and bottom) stand out 40 mm from the glass, so a snail on one face leaves the others open. Slots are 2–2.5 mm wide, under…

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