seeing interesting behavior in my silver dollar tank...

Magnum Man

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a behavior more like pair breeding, than egg scattering...

1st, I have 2 "common" dollars, that happen to be a male and female, and 3 of the tiger dollars , 2 of which are adolescents, the other an adult female, currently in this tank..

I know as a group, they will have a pecking order, as a "school", but the male and female common dollars appear to have a nest, and they typically drive out the other adult ( tiger female ) from the nest area, and they seem less worried about the 2 adolescent tigers, and often both "commons" are in that nest area...

maybe I need a bigger school, or another 1-2 common dollars... I do have a group of 3 adolescent red hooks coming, to make the whole school bigger... in preparation to move to the 250 gallon that will get set up, after I fully retire this spring ( I'm waiting for warmer weather to pull up part of the floor, over a part of the house that has a crawl space with no access, to reinforce the floor in that area for the weight of the tank and stand )

the pair of commons, are not being mean to the others in the tank, as a whole, they are just keeping the other adult out out the nest area, and for the most part, one or the other is in that nest area all the time, which is kind of a cave area, they carved out of the overgrown pothos roots in this tank, so it is more shaded, and protected from view, with a layer of chewed up root pieces on the sand, than in the rest of the tank, so they could have eggs in there??? but this was not my understanding of dollar breeding, so I expect there is probably not any eggs there???

thoughts???
 
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both common dollars in their nest area... ( yes, there are 2 adult fish under there, side by side ) others are allowed "close" but not "in" the nest area
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there is a lot of free swimming space, but from what I'm seeing they also like riparian vegetation as well, and I think they are often found in river flood plains in the rainy season
 
Picture from another angle... I don't see any eggs or fry, but took this picture so I can take a closer look with zoom... fish on the left looks to be smiling for the picture, or wants to bite me for getting too close...
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