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Hi i have 2 RES with 2 inch big my question is how long will it grow to be 5 inch or 6 inch cuz im just puting them into a 6 gallon aquarium and i want to upgrade to a 75g or more but my parent will not alow me to upgrade unless they will grow 5-6 inch

Your RES will be about 5" in about 2-3 years, but that will be far too long for them to be living in a 6 gallon tank. Even at 2 inches, I can't imagine how they can even swim in a 6 gallon! See if you can get a rubbermaid storage container, they come as large as 50 gallons. They are very inexpensive, and should last you a year or two.

its not that small its about 21lx12wx6h with 4inch of water

That's an interesting size tank! The 6 gallons I've seen are usually short in length but tall.

this is custom made way back 10 years ago

tre-zet - Sliders need 10 gallons per inch of carapace. A six gallon tank is way too small. If the two get to 5 inches that will require a 110 gallon tank. If you want to upgrade later, you should get a 55 gallon for the mean time. The will need that much room to grow. Good luck! m.

trebzet, that 6-gallon tank is already too small for them. They're going to live really miserable lives if they have to stay in that until they're bigger...

ahh maybe next month ill get a 45g tank