Discus Questions

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For 3 discus, assuming your water is correct, I would say your filtration is fine. I would get a 250 watt heater, and a coralife dual T5 bulb (it will support plant life if you decide to add water sprite or something)

You might be able to keep two small ones, 1 1/2" - 2" for a very short time. A minimum tank should be 55 gal for the eventual size they get, especially if you are meeting all their needs.

2-3 discus, make sure you have enough lighting for plants as mentioned above because they really seem to help out. Planning on any tankmates? Cardinal tetras and cory cats work great.
Jason

As long as the water changes are frequent, the biological capacity is sufficient and the temperature is warm (mid 80's), then you can easily keep 4 discus in there very happily. I suggest no less than 4 because discus are a schooling fish and of course do better in numbers.

What is your pH once settled/aerated for 24 hours? As long as the pH isnt above 8.2 or so, then the discus will be fine. The key with discus is the warm water and the frequent water changes....50% once a week is the minimal....the more often, the better. Some hobbyists are able to do 50% once a day, but most cannot do this due to other commitments.

-Ryan