Posted: Wed Aug 12, 2009 8:54 pm
Wicca- 400 gallons might not be to small for them like you think. I judge the size of the tank necessary by their behavior, not the 10 gallon rule. The reason being, it seems to me that when multiple RES behave cramped, they bump into each other or their tank objects a lot, can't get privacy, flutter over tank objects excessively, nip at each other or have huge fights, and eventually act very stressed out.
I think the 10 gallon rule was invented because there is no other concrete answer to the question, "How big should the tank be?" Plus, most tanks are sold at sizes of even numbers, so instead of getting 397 gallons, you have 400 gallons. I'm sure there's some kind of math involved in the way they size tanks.
My turtles lived in a 10 gallon tank for a whole year, and only started acting cramped a month ago. I bought them a 55 gallon yesterday.
Phryne - Japanese bobtail, 11 y.o.
Hurricane - RES, approx. 19 y.o., 7.00in. long
Typhoon - RES hybrid, approx. 19 y.o., 8 in. long
Sadie - RES, approx. 30+ y.o., 11.5in. long
Sophie - Colombian red tail boa, 15 y.o., 5 ft. long