Actually agree with you herePersonally I think you could chose better suited species for that foot print of tank.
I don't think silver dollars are truly comfortable in groups under 6 individuals. I also think by their active and jumpy nature they need a tank of at least 6 feet to act calm and normal.
I will probably get jumped on here but I also believe an adult Oscar needs a min 180.
I would look at slightly smaller cichlids like some of the various acaras that won't surpass 10 inches.
I would have smaller shoalers like BA tetras or bleeding hearts but in larger numbers. I think the fish would look a little more to scale with their tank and would have more freedom in their home
For a fish that averages what 13"? And is solid like an oscar, to say that your 125 with a depth of 18" is a different story then a tank that is 6" deeper footprint, sure maybe for the tetras beeing that they are an active schooling fish.So what footprint is the tank? You say a 120, those are normally 4ftx2ftx2ft. That is not a good footprint for an Oscar tank nor for Silver Dollars.
Now if you have a 6ftx18inx20in 125gallon that's a different story.
A 120 is by all means realistic for an oscar. Just stay up on waterchanges and lose the silver dollars.
For a fish that averages what 13"? And is solid like an oscar, to say that your 125 with a depth of 18" is a different story then a tank that is 6" deeper footprint, sure maybe for the tetras beeing that they are an active schooling fish.
I belive it is actually in the middle, 5' by 18 or 19 " by26 high lol, dual overflow with 36gal sumpSo what footprint is the tank? You say a 120, those are normally 4ftx2ftx2ft. That is not a good footprint for an Oscar tank nor for Silver Dollars.
Now if you have a 6ftx18inx20in 125gallon that's a different story.
First of all Thanks for the supportPosted in your other thread but I will add this: I kept an Oscar in a 90 gallon for years, and I believe it was adequate. 125 would be better, but I think that 90 or 120 is just fine. 55 is definitely too small, the 18" width 4' tanks are absolute minimum IMO.
I think your stock list would be do-able in the 120 with proper maintenance, but if you felt it was too much, by all means take some fish off. Lighter stocked is generally better. If you were to replace the Oscar you could add more of a smaller species like stanzz suggested, which might make for a more active, interesting tank.