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Considering a change of heart, thinking of closing my saltwater tank and going back to keeping discus.

There's so much conflicting info online about keeping discus in a Juwel Rio 180 aquarium - 101L x 42d x 50H.

What's a safe number for this tank?

I'd be using a Fluval 307 external filter.

Re: Discus in Juwel rio 180

I've had experience with Discus in a Juwel Rio 180, started about 5 years ago. In my opinion, 4 is the maximum you can comfortably keep in this tank, but even then, I didn't see the desired growth rate.

Now, I've upgraded to a Rio 450 for my adult Discus, and I use the 180 for growing out juveniles - never more than 2 at a time. This setup works well for me, as the juveniles can eventually be moved to the larger tank.

Re: Discus in Juwel rio 180

Assuming your tank measurements are in cm, that's 56 gallons. The general rule is one adult discus per 10 gallons.