While I'm not fluent in these species, I have kept a Royal Loricarid. They are quiet and usually stay hidden in plain sight (camouflage). Pretty much nocturnal. They move like a dragon when they swim (really cool to watch, trust me). They eat algae wafers (they don't hunt for algae like bristlenose plecos, so don't use it as an algae eater), shrimp, and whatever else can fit in their small mouths. They have long trailing fins, so don't put them with fish that would be tempted or are known to be fin nippers. Also, I would recommend a small group of them; they are very small and thin but long, so they won't take up much space. I would say the minimum for one is 30 g, but larger would be needed for a group (and would be preferred all around).
Also, ensure you target-feed them if you have more assertive feeders in the tank. Unfortunately, I lost mine because he was underfed and outcompeted by his tankmates.
I'm assuming the care for the chameleon whiptails is similar to that of the royals but always do your own research for specific species.