turtles in a 30 gallon tank?

[Gourami Swami]

If you want that many you will need more like a 125 or a proper pond setup imo.
Keeping turtles together can be tricky. You sometimes will get lucky and they get along, and sometimes you won't. But providing them with enough space is essential if you want any shot of keeping them long-term.
Males tend to be aggressive to other males. Females less so usually but they can still be aggressive, and they grow larger in many species.
Here's a setup I built for two red eared sliders years ago. They were male and female and got along well for years in this 72 gallon.

 

[I like turtles]

Wow that's big where did you buy the material to make that

 

[Gourami Swami]

Wow that's big where did you buy the material to make that

Home depot I got the wood and acrylic, you could get it at any hardware store. The tank itself was just a standard 72 bowfront, I built the ramp and platform.

 

[I like turtles]

Did you need water heaters if so can you tell me how much it all costed in the end I might try to build that

 

[Raka]

*Chuckles* 20 gallons.

Its actually 18.7gals.

 

[Gourami Swami]

Did you need water heaters if so can you tell me how much it all costed in the end I might try to build that

I did have a heater in the tank. If you live in warmer areas you may not need one. I built this thing 10-15 years ago, I don't know the exact cost. You will need tools and know-how. My father is a hobby woodworker with both, and helped me with it.

 

[I like turtles]

Thanks I will look into it and let you know how it went