It could very well be bacterial and need a bacterial medication. @Colin_T what do you think or did @PheonixKingZ already steal your advice. Lol!
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I moved the tetras to a 10 gallon tank by themselves. I watched them very close along with my husband and noticed they were nipping at the other fish you were right @seangee and as soon as I removed them my Gourami came out from hiding and is swimming around now looking happy. I can’t believe I’ve never noticed them doing that anytime I seen them they were together just hanging out but I watched them for about a good hour and 15 minutes and seen them nip at every single one of my fish and I was completely dumb founded. Now that they are removed I will keep an extra eye on the rest to see how they are doing the next few days then go far there
What you do with them next is up to you - but they are still going to chase and bite each other. If you do decide to keep them I would suggest at least 12 and plenty of tall plants for them to escape and hide from each other. This should be either a species only tank or have very carefully chosen tank mates. Obviously that means the 10G is not suitable as a permanent home. I had 12 in my community tank hoping that would be ok - but they were still little terrorists. The man in the LFS tried to sell me another 12 and said that would sort it but there was no way I was taking the chance.
FWIW seriously fish is worth checking before getting any new species. These days when I go into an LFS I usually know exactly what I want and in some cases may have a second or third choice in my mind if they don't have my first choice. If I see something I like in the shop I write down its name and take some photos (sometimes they have the wrong names on the tank ) and only come back if I like what I found. Of course you could look them up on your phone but I like to check other sources too. I know that sounds pedantic - but once you have been through that experience you realise its definitely worth it IMHO
She looks a little fat but not really pregnant. Hard to say but my vote would be a no. Let’s see what others say.
Oh ok thank you so much I’m not sure her age but I bought her in February From a pet store and that was her first deliveryIf she’s young, she can have just a few. They may have snacked on a few too. As she gets pregnant more, her fry will probably increase in numbers.
check your water quality for ammonia, nitrite, nitrate, pH and GH.
make sure there is 0 ammonia and nitrite, less than 20ppm nitrate, the pH should be above 7.0, and the GH needs to be above 250ppm for mollies.