Apogon leptacanthus

I don't see the cardinal being aggressive towards the seahorse, but I do see it as a competitor for food with the seahorse. Mine loves to eat and is very quick to chase the food down. If I were you I would keep it a species tank of seahorses.
 
They would be fine. I just squirt some food to the fish first and then I feed the horses while the fish are eating theirs.
Carrie
 
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