The tank holds about 5 liters, although this most likely depends on the pressure of the water in the pipes. There is still a ± meter left for connecting the white tube (everything is quite compact for me, which is probably why).
To supplement my review, I've included some photos for further insight.
Aquael Fan Filter Mikro Plus
35 Review
KEDSUM 330GPH Ultra Quiet Submersible Pump With High Lift And Grounded Power Cord - Ideal For Fish Tanks, Ponds, Aquariums, Statuary, Hydroponics - Includes 3 Nozzles And 1500L/H Water Flow
39 Review
Humidifier / air purifier "Fanline Aqua VE400" with an ionizer, with a capacity of 410 gr/h
44 Review
🌿 Enhance Your Freshwater Fish Tank with Greenpro Java Fern on Driftwood Live Aquarium Plants
27 Review