Wow, lots of bad info going on here.
Here's the deal, sure you can put whatever together short term and they will appear OK at first, maybe even for a while, but eventually they will mature, and want to claim territory.
When this happens, it can be like overnight, all out war, maybe even deaths before you even notice.
Don't be fooled by short term success stories.
Even a 210g probably isn't big enough for 2 pairs or more IMO.
There are very rare situations, certain species that MAYBE might take host at opposite ends of tank, but you can't even count on hosts staying at opposite ends.
A couple people that are pretty experienced have many from the same clutch that worked out long term, but that is rare as well.
I would suggest reading the stickies at top to better educate yourselves by peeps that have been doing this long term, and learn from their exp.