Can a serpae tetra live with betta crowntail in 8 gallon tank. is being harassed 36 ga tank other new fish?

Serpae tetras and betta crowntail fish can be incompatible tankmates. Serpae tetras are known to be nippy fish, and they may harass the betta crowntail, causing it stress and potentially leading to health problems. Additionally, an 8-gallon tank is too small for both a betta crowntail and a group of serpae tetras. The minimum recommended tank size for a betta crowntail is 5 gallons, and the minimum recommended tank size for a group of serpae tetras is 15 gallons.

In a 36-gallon tank, the betta crowntail may have more space to avoid the serpae tetras, but it is still not an ideal pairing. Introducing new fish to the tank may further stress the betta crowntail and potentially make the situation worse.

If you are considering keeping these two fish together, it is important to carefully monitor their behavior and be prepared to separate them if necessary. You may also want to consider adding some plants or other decorations to the tank to provide the betta crowntail with hiding spots.