[rayjay]

You are looking for "the holy Grail" of seahorse keeping.
They don't exist.
Many pay premium prices for coloured seahorses only to find them go a "bland" yellowish or brownish or blackish after getting them in their tanks.
Seahorses change their colours to suit their mood, and to suit what they feel is the best camouflage colouration for where they are.
I have worked for years to find a way, as I'm sure many other have according to posts on the "org", but no one can guarantee and lasting colouration.
The best I've come up with so far is to paint the bottom and back and ends sky blue, and remove the live rock to the sump. Even then, the reds and oranges and not as brilliant as when I bought them.

Forgot to add, DON'T add seahorses from another breeding source to your tank, especially with H. kelloggi in their already. (they don't have a good track record long term)
Species only set up is best for seahorses.
Pipefish is another that should not be added to your seahorse tank.