Betta Fish: Is Betta okay?

Water parameters are amonia 0 and nitrite 0. The tanks cycled for 5 weeks before we got the fish. Temperature is 27 celcius. I know the heater is higher but the caliberation didn’t work. We are working with 3 thermometers and they all say it’s 27 when the heater says 32, so we believe the thermometers.

for now i would say that’s he’s just adapting to his tank and the new environment. i’m assuming the tank was cycled prior to getting him and that he was acclimated to the tank water properly. bettas are also very sensitive fish especially when it comes to temp so just make sure it’s at least at/above 76° to be safe. his fins looks beautiful and they’re not clamped. if they do ever clamp or start to look torn then that’s a big sign of illness. regarding his appetite, some bettas are simply just picky. my betta never liked flakes or bloodworms until he got older and he only wanted to eat bug bites and brine shrimp. it’s best to just feed him whatever he’ll eat for now but if his lack of appetite for things continues to stay the same (and is accompanied by other symptoms) then that is a cause of concern. he does look like he’s breathing a tiny bit hard but if your parameters are how they should be then it could also be due to a lack of oxygen/filtration or maybe even infection. as for the “grey crusty bump” that you mentioned, that is a big concern and most of the times means illness but it’s hard to say considering how other potential symptoms weren’t mentioned (but a lack of appetite could be one). something like that could be bacterial, fungal, or parasitic and possible medication will be difficult to find because you’ll need something that will directly target it. theres illnesses such as columnaris(bacterial), fungal infection, tumor like you mentioned, etc. it’s best to observe if there are any other symptoms that may accompany the bump and then research it all to get a probable cause. if his health happens to rapidly decline and the bump is still there with no known cause, then a broad spectrum antibiotic may be needed such as kanaplex or polyguard to treat a range of things but it’s best to not go down that route if not necessary since those medications can be harsh. for now, just do frequent water changes, test water parameters often, load the tank with tannins, and maybe use seachem stressguard (safe for fish/plants and tank cycle) or anything similar as it is an antiseptic and prevents infections and can also treat minor ones. another commenter may even be able to tell what it is just by looking at it but i think you should try to see if you notice other symptoms to narrow down or see if it just simply goes away within a few days.

The tanks cycled for 5 weeks before we got him. The amonia and nitrites are 0. We aclimated him by putting the bag he came in in the water for a while, and adding some tank water in it every 15 minutes 4 times. Then we put him in the tank (not with the water from the bag). I only saw the bumb when we could clearly observe him in our tank. In the fish store he was in dark water with lots of plants and we didn’t see it there. The breathing might still be from the stress of moving, he’s only been here for 2 days. I’m just really worried about the bump. We’ll keep observing him. He looks very healthy looking at his colors ans fins, and I’ve read that it is a big indicator of their health. I’m sorry if i’ve made spelling mistakes btw. English isn’t my first language 🙂