How to tell wether my seahorse has a problem or not

I have dwarf seahorses in this tank and the I have one snail in the same tank and yes it is cycled it has been set up without seahorses for over 1 and 1/2 months and about 1 week with seahorses and one of my seahorses the belly (only a tiny bit) looks a bit bigger but I did not see them dance so I don't know if its babies or a problem
 
If it's not having trouble swimming, then it is probably fine. Dwarf seahorses puff up their pouch to display to females and intimidate other males. It also might be pregnant, as they get knocked up pretty easily. :trampolin:

There isn't a good way to tell if it's pregnant or just displaying. Some will deflate shortly after displaying, others will keep it filled with water, proudly showing it's pouch for all to see. It can be slightly more dark looking as the pregnancy progresses, but it's really subtle and I wouldn't expect to be able to tell the difference until you've had them and observed them for a long time.
 
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