Seriously Fish
the upper end of the range is likely a seasonal high ... not sure where your posted 26/27C comes from but I've always kept chocos at 23 - 25C, some heater issues has left them at 22C for weeks - I didn't check & behaviour was completely unchanged
They do display some interest in shrimp so I'd make sure shrimp have some secure places
S vaillanti are far more "shrimp safe" in my experience but also require a larger tank as they seem to need more individual space while still requiring a group (to thrive long term)
You don't mention kitchen tank size but 60cm x 30cm is a minimum (re Seriously Fish)
- I have a group of
S osphromenoides in a 60 x 45 x 55 (height) & would consider this a minimum if you don't want to lose some of the more subordinate fish, they use the entire tank & do really like overhanging wood, plants, large sword/anubias leaves, surface plants etc
These fish can jump very well, especially the
S vaillanti - & they are very fast about it ... so often they seem to just drift about that I'm surprised when they suddenly dart across the tank or ram their tankmate - who generally seem less surprised than me & evasive actions limit the impact