Jess Posted September 18, 2022 Share Posted September 18, 2022 (edited) I keep two fish species (Sphaerichthys sp. and Hemirhamphodon sp.) that I was surprised to find are...hmm, territorial and a little grumpy with each other. A good deal of chasing, but (so far) no injuries and their beautiful, rich coloration and good eating suggests they are healthy and happy. I have 8 Sphaerichthys sp. and 7 Hemirhamphodon sp. in a 45-gallon (36" x 12" x 24" high) planted tank (with floating plants too). The question is about group "dynamics" for fish that are kind of "semi-aggressive" like this. If I add 4-6 Sphaerichthys sp. would that actually help with their aggression or would the newer group get bullied? I know Cory has mentioned one approach for minimizing aggression is to either have only 1 of the fish, or a lot of them. Also, what about if these 4-6 fish are smaller than the existing 8? For the Hemirhamphodons, my inclination is to not add any because they almost only inhabit the surface, so there relative space is kinda more "2-dimensional" - at least this is my observation. As long as I have floating plants, the 7 of them only generally "bicker" around meal times. I'd appreciate others' thoughts and experiences, especially if you've kept big groups of Sphaerichthys! I have a special affinity for all the species in this genus, for some reason. Thanks! Edited September 19, 2022 by Jess question clarification Link to comment Share on other sites More sharing options...
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