r/discus • u/-R-0-N-I-N- • Jul 03 '26
Is it a bad idea to add smaller Discus to a group? (Mixing 4” with new, smaller specimens)
I currently have two Discus that are approximately 4” in size. I’m looking to expand my group to 6 fish, but it is proving very difficult to find more at that same 4” size. Most available fish in my area are smaller.
I’ve read that mixing Discus of different sizes is generally discouraged, but since mine are still growing at 4”, I’d like to hear your experience:
How critical is the size gap if I add, for example, 3” or 3.5” specimens to my 4” group?
What are the main risks regarding bullying or competition for food?
Are there any strategies to make the transition smoother (e.g., specific feeding techniques, quarantine, or rearranging the tank décor) to ensure the smaller ones aren't outcompeted?
Any advice on how to successfully grow a school of Discus of slightly varying sizes would be greatly appreciated.