Well, in my humble opinion, I don't think you can keep 4 turtles in an aquarium. They are to un-predictable. It's like a shoot and miss, sometimes turts will get along great!! Other times you can give them all the room in the world, and they will still fight!!! I had my two little guys in a 240 gallon tank(the recommend size for two full grown female sliders) AND THEY STILL FOUGHT EACH OTHER!! I would be looking into a large pound, or multiple set-ups(either aquariums, stock tanks, or RubberMaids.). The recommended size aquarium for four turtles, is about 400 gallons(which is ridiculous), and they still might fight!! So, if you can afford a tank that large, good for you!!(I sure wish I could

) But be prepared to separate the tank if necessary. If you can't go that big, then go AS BIG AS YOU POSSIBLY CAN AFFORD!!! It might be a time to consider giving away one, or two of your turts.

I can barely afford two turts, I have no idea how you are doing it with four!!!!
What ever you chose,
GOOD LUCK WITH IT!!!

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RES's
Tank, SCL 3.75in.
Diesel, SCL 3in.