Rhoms grow 1/2in a year so you got plenty of time with that tank. If you want him to display darker colors you're correct about the darker background and substrate. Good luck with him.
+1 for what SandNukka15 said.Another noobie question:
Does rhom prefer fast moving water flow?
The water output from the canister seems pretty fast for a 3 foot tank - I directed the rain bar to shoot the water near the surface level at the moment.
Sincere thanks in advance.
Well if you get him to come out quickly then I applaud you. It took a full year for my Sanchezi to become comfortable enough to come out of his hiding spot.Bagged him home today.
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Put in a couple of small monos and red eye tetras to encourage him to swim around. Understand this species is skittish and tend to hide a lot. So now he is at end of the corner near the filter inlet. LOL!
Will try to upload some pics when he is more stable and outgoing.