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.
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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.