Will my equipment fit in an all-in-one tank?
All-in-one tanks hide their filtration in a moulded chamber behind the display wall. That chamber, not the tank's volume, is what your equipment has to fit inside — and it is the measurement most product listings never mention.
Will my equipment fit in an all-in-one tank?
It depends on the chamber, not the tank rating. ReefPicker measures the part against the tank's published internal chamber dimensions on all three axes. Less than 1.5 cm of slack on any axis is flagged as a very tight fit rather than a clean pass, and a heater needs 2 cm above its own length to stand upright and still be removable.
Why does a skimmer rated for my tank still not fit?
Because the rating describes water volume and the chamber describes space. A skimmer sized correctly for a 60 L all-in-one can still be taller than the 30 cm wall it has to sit behind. The two numbers answer different questions, and only one of them is usually printed on the box.
What if the manufacturer never publishes chamber dimensions?
Then ReefPicker says so rather than guessing. A missing measurement is reported as a data gap, not passed as a fit — a green verdict for something nobody measured is worse than an honest blank. Where a maker does publish them, the check runs automatically.
Can I use a normal sump skimmer in an AIO?
Sometimes, if the chamber is deep enough and the skimmer's rated operating depth matches the water level in it. More often the answer is a compact in-chamber model or a hang-on-back unit. The deciding numbers are chamber height, footprint, and the skimmer's own depth range — all three, not just the first.