But that skimmer is rated for 100 litres, roughly half the tanks' capacity?
@Nazeer
Maybe Waterbox should amend their spec sheet and include the AIO compartment dimensions like Innovative Marine AIO. I had a looked everywhere. No luck. But i did find a thread on reef2reef with a a pic that looks like a JNS / Aquamaxx WS-1 skimmer in the back.
https://www.reef2reef.com/threads/waterbox-aio-50-3.441450/
Here's the specs on the skimmer.
Footprint : L 5.9" x W 3.2" (150mm x 82mm)
Height: 14" (excluding collection up)
Collection Cup Height: 5.5"
Recommended Water Level: 8"-10"
Pump(included): Shark 1.0
Pump power consumption: 11 Watts
Filtration Rating: up to 65 Gallons (250L) (light bioload) or 30 Gallons (115L) (heavy bioload)
Requires approximately 5.5" of clearance to remove collection cup.
I'm pretty sure this skimmer will fit too.
Product Specification/Models
http://www.redstarfish-aquarium.com/sale-9090146-aquarium-mini-protein-skimmer-sq-90.html
Aquarium Mini Protein Skimmer SQ-90
Pump power H-1100,220V/50HZ
Size:130*100*400mm
Fit volum:90L-130L
MAX litre:250L
Water level:180-200mm
Max air inflow:220L/H
Qmax:1100L/H
Best is you mail waterbox for the AIO dimensions or use the live chat via their website. Good Luck!!