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I'm wondering if I can keep just two discus in my 34 gallon tank. I'd get them as small as I could find them.

I'm setting up my 34 gallon Red Sea Max right now... I'm going to dry start for a month or two to let the HC grow across the substrate. Once it is filled, I'll likely add short bunch plants and stubby rosette plants (like Pogostemon helferi)...

Since it won't be like a "jungle style" tank packed with plants, there will be tons of swimming room. The top 1/4 of the tank is literally free space that will just be water. The middle 2/4 of the tank has a piece of branch diftwood and will eventually have a few short plants around that driftwood. The bottom 1/4 is hilly substrate that will be completely covered in HC.

Here's a video of the tank so you can see the space I'm working with...
http://youtu.be/ZmeX3cfcb8U?t=40shttp://youtu.be/ZmeX3cfcb8U?t=40s
 

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Keeping just 2, 3, or 4 discus is not a good idea. They are very social fish and do best in groups of at least 5 or more - keeping less than that is an invitation to serious bullying/pecking order aggression issues.

And getting small discus of less than 4" in size can be a challenge to grow out properly in a planted tank. Youngsters like that have insufficiently developed immune systems and are prone to a variety of health issues - they should properly be kept in a bare-bottom tank, with large daily water changes, and several daily feedings, so as not to risk getting stunted fish.

Consider getting at least 4" fish or larger - at least 5 of them, and keep them in a minimum-sized tank of 55 gallons or more, as previously mentioned.

And be sure to get healthy, quality stock from a known, recognized experienced and reliable source for supplying quality discus. Otherwise, you set yourself up for frustration & disappointment.
 
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