I also have a water box aio and their baffles go all the way to the bottom. This is the first time I've actually seen this design flaw. I do love the dimensions. It's a great little tank. The DC return pump that's included works great, and the first chamber perfectly fits the tunze 9004 DC skimmer.
My set up as as follows:
IM fusion pro2 with APS stand
Included return pump, plumbed through two spin stream rotating nozzles.
Tunze 9004 DC skimmer
Innovative marine Helios heater
6 watt nano UV sterilizer
Included filter caddy running floss and a small bag of chemipure blue
Tunze 3155 ATO
2x Nero 3 power heads
Radion xr30 pro with RMS mount
So far I have zero complaints about ANY of the equipment, other than the baffle layout of the tank itself. Otherwise the tank is super solid and very nice.
Here is a diagram of the baffle configuration. If they just went all the way to the bottom, it would be great.
Have you seen the Red Sea NanoMat? Wondering if that'll fit in the IM tanks.
Would you mind taking a pic of the IM40 in the room? Trying to gauge how big/small this tank is. I have a couple of IM dealers in my area, but none of them has the 40 on display.