Is 81 degrees too hot for my fish?

I recently had my temperature at 75 degrees (it's been this for 2 years) and saw a video stating that bettas should be in 80 degrees water. So I searched it up and all my fish should be fine right? I don't want it to be too much for them and I don't want the oxygen levels to decline because of the higher temperature. My heater has no setting in between 75 and 81 degrees so it's either-or. I have a 75-gallon.
Here is my stock:
5 Angelfish
3 gouramis
5 Giant danios
8 Glofish tetra
1 Betta Fish (M)
1 algae eater
1 nirite? snail

 

I recently had my temperature at 75 degrees (it's been this for 2 years) and saw a video stating that bettas should be in 80 degrees water. So I searched it up and all my fish should be fine right? I don't want it to be too much for them and I don't want the oxygen levels to decline because of the higher temperature. My heater has no setting in between 75 and 81 degrees so it's either-or. I have a 75-gallon.
Here is my stock:
5 Angelfish
3 gouramis
5 Giant danios
8 Glofish tetra
1 Betta Fish (M)
1 algae eater
1 nirite? snail

Why raise the temp if the fish are doing fine now?

 

i have black skirt and cardinal tetras, with a cory and my tank goes to 83 for a large part of the day =(

 

The danios are the only fish in your tank that can't take the warmer water, they are a cooler water fish similar in temps to gold fish.

But I must ask you have a mail betta fish in with gouramis and angels? Usually any combination of these fish is not a good idea.

 

The danios are the only fish in your tank that can't take the warmer water, they are a cooler water fish similar in temps to gold fish.

But I must ask you have a mail betta fish in with gouramis and angels? Usually any combination of these fish is not a good idea.

Ok I’ll lower it down for the danios then. Yeah my tank is big and I have a lot of hiding places so it’s all working out great. I know it’s a risky stock tho

Why raise the temp if the fish are doing fine now?

It’s because my betta was kind of tired looking and I was watching a video about bettas fish and how they’re supposed to be in higher temp waters so I thought it would be best for the bettas. It was a vid from KGtropical (I thing that’s their channel name)

 

The danios are the only fish in your tank that can't take the warmer water, they are a cooler water fish similar in temps to gold fish.

But I must ask you have a mail betta fish in with gouramis and angels? Usually any combination of these fish is not a good idea.

Hm I searched it up some more and bettas should be kept in 78-80 and danios are hardy and I found a lot of info that said 80 degrees would also be fine for them. I’m going to stick to 81 degrees since I think it’d be best for both species.

 

Hm I searched it up some more and bettas should be kept in 78-80 and danios are hardy and I found a lot of info that said 80 degrees would also be fine for them. I’m going to stick to 81 degrees since I think it’d be best for both species.

Bettas can live in 75 degrees, I doubt that's why your betta has been acting tired. Why would lower temperature make the fish tired? I could be entirely wrong though

 

Bettas can live in 75 degrees, I doubt that's why your betta has been acting tired. Why would lower temperature make the fish tired? I could be entirely wrong though

Yeah, you can search it up, it's because colder waters make their body sluggish. Like how if it's too cold for us we aren't that active.
"Betta fish thrive when the water temperature is between 78-82°F (26-28°C). Outside of this range, your betta can become lethargic and sleepy."

 

Cooler water slows their metabolism. Warmer water speed it up. 85-90f is too high for most species, 70-65f is too low for most species.

If the water is warmer the fish will consume more, and move more and use more calories, if it's cooler they will take it easy and eat less and slow down digestion not necessarily lose wait but not gain in fitness either.
Warmer will shorten lifespans so will cooler. The "good zone" for most all tropicals is 75-80f with 78f being the middle of that range.
81f or 82f won't hurt much unless you have cooler or hotter specific fish, it will speed up metabolism and may shorten the lifespan some though. they will eat more and grow faster and pack on weight/muscle as a result of doing it.
And that concerns me the most. A male Betta is usually sold as fully mature adults, by the time they get bought, they are past their prime and just have a couple years left normally. I really don't see a benefit to running hotter unless the fish is a picky eater, or you are trying to breed the fish or trying to grow out, a mature betta that most people have can't really afford to lose time off the back end of life.

 

2 years later. i like to keep my tank at 76-77

 

2 years later. i like to keep my tank at 76-77

my bad. you look at one thing it recommends related things and before you know it, it's 1912 and the pony express is coming up the driveway.