Here's why:
* Different Water Parameters: Goldfish prefer cooler water temperatures than gouramis. This mismatch in ideal water conditions could lead to health problems for either fish.
* Different Temperaments: Gouramis can be aggressive, especially towards smaller or slower fish. A goldfish, being less agile, could be vulnerable to the gourami's aggression.
* Dietary Needs: Goldfish are omnivores, while gouramis are primarily herbivores. This means their dietary needs are different, and a tankmate that eats a similar diet may not be suitable.
Instead of trying to keep them together, consider choosing tankmates that are compatible in terms of their water parameters, temperament, and dietary needs.
Here are some good tankmates for goldfish:
* Other goldfish species
* White Cloud Mountain Minnows
* Rosy Red Minnows
* Corydoras Catfish
Good tankmates for Gouramis:
* Other gourami species
* Harlequin Rasboras
* Zebra Danios
* Corydoras Catfish
Remember to always research thoroughly before adding any fish to your tank to ensure they are compatible and create a healthy environment for all.