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Why not get something besides the danios? They're the ones that are pretty out of temperature range with the others. You could try between 76-78 but that's going to be stressful to them as it's too high and it's on the lower end for all the other fish.
Agreed with above. CPDs and GBRs are mutually exclusive temperature ranges. GBRs are extremely sensitive and prone to illness when kept below 80F (82-84 being ideal). CPDs suffer from low oxygen in those temperatures and need it far cooler (high 60s, low 70s). Trying to average the temp ranges of both will make neither side happy.
I think they'd be OK in a 24" long tank, especially if there are no other bottom-dwellers. Mine spend a lot of time in the middle/upper strata of the tank, and I think that's typical.
I would highly reccomend not keeping these fish together, they require entirely different parameters. Gbrs will highly appreciate soft water in low 80 ' s. Cpds will do a but harder water in the mid 70 ' s. It may not sound all that big but I can assure you it's the difference between having a fish for a few months and a few years. They also have differing diets..
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