Aquarium micro, macro, carbo holder

Hello !

If you like my work, please rate it.

For storing, practical dosing, and preparing aquarium plant food in advance. We can measure out the daily doses in advance so that we only have to pour them into the aquarium in the morning. Or if we have to entrust our wife with the daily plant food dosing, it is also useful.
The storage containers were purchased from temu. They are 50ml.
The test tubes are from temu.
The dimensions are in the pictures.