Can you put a betta fish in tank with seahorse?

It is generally not a good idea to keep betta fish with seahorses, as they have different care requirements.

- -Bettas- -

Bettas require warm, freshwater with a temperature of 76 to 82°F (24 to 28°C), while seahorses require cool, saltwater with a temperature of 68 to 74°F (20 to 23°C). The difference in temperature requirements alone makes them incompatible tankmates.

- -Water Chemistry- -

Bettas need soft, acidic water, while seahorses need hard, alkaline water. These differences in water chemistry requirements make it difficult to keep them in the same tank without compromising the health of one or both species.

- -Aggression- -

Bettas are known for being territorial and aggressive, especially toward other fish that have similar colors or fin shapes. Seahorses, on the other hand, are peaceful and non-aggressive.

Keeping a betta with a seahorse could put the seahorse at risk of being attacked and injured by the betta.

- -Tank Setup- -

Bettas and seahorses also have different requirements in terms of tank setup. Bettas need a tank with a tight-fitting lid to prevent them from jumping out, while seahorses need a tall tank with plenty of vertical space to swim in.

Additionally, bettas need a variety of hiding places, while seahorses need an open tank with few obstacles.

All of these factors make it clear that keeping a betta fish with a seahorse is not a good idea. It would be better to keep them in separate tanks where their individual needs can be met.