Hi dusty rider,
You have some wonderful tankmates for your 2 seahorses. Very good choices!!
Ecogirl is however right most mandarinfish starve to death unless placed in a large well established tank without food competitors and with tons of live rock.
Also your 20g tank is at it’s maximum capacity at this point and any additional fish will be overstocking it. If everyone is happy and healthy it would be best to leave well enough alone.
Cheers,
Leslie
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