Blue rams actually do better in temps of 84F and above. Bolivans are at home in 74F-78F with a little higher for breeding, so you'd have far more choices of tetras with the bolivans than the blue rams.
Ok, was just worried about the comment on glowlights not liking the higher temps... I've seen ranges from 60-80°F and 70-80°F for tetras... And seen rams from 76-82°F, Was planning to target around 77-78°F for that tank... Seems like that would hit a sweet spot for rams and tetras?
I tend to keep M. ramirezi at 84 or higher. That's one of the reasons they do so well with discus. If you plan on keeping things in the 70s then M. ramirezi are definitely out. The Bolivians will still be a nice centerpiece fish, IMO.
They are harder to sex than M. ramirezi, especially if you are buying sub-adults. It's not a foolproof method but I'd go for the largest, most dominant fish in the tank for a possible male and then get three smaller ones and hope for females. Their fin extensions tend to be less extreme and they are often a bit shorter and fatter, but sometimes these differences don't become noticeable until they've settled into your tank and matures a bit.
If you get 4 rams, you have a good chance of getting a mix of sexes. If you end up with a pair, simply remove the female and rehome her.
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Well, I could end up with a good excuse for another tank, lol...
With all the limestone in Indiana, I've been told our tapwater is perfect for cichlids
There are hundreds of species of Cichlids spread across three continents and a huge variety of environments, your water is pretty good for African rift lake Cichlids (which sadly some people often refer to as simply "cichlids", as if no other cichlids exist!), but saying any type of water is "perfect for cichlids" is a ridiculous generalization.