Aquarium bottle holder 4mm glass(4.5mm gap) v1.0

Hi,
this is mine bottle holder for my 37.5L(10galon) aquarium and it is used to hold water in your aquarium on a steady level.

How to use:
Print this tool and use a 0.5L bottle (with sharp bottleneck).
A bottle can be placed in a hole of the holder and holder with the bottle can be placed on the corner of the fish tank. The bottle can be refilled if neceserry. TIP: When you want to refill bottle, do not remove bottle from the holder instead refil it with the holder attached for ease of use

This tool is used to concentrate CaCO3 depositors on one fine line by holing water level at the same level and it is not substitute for the water change.