Posted: Sat Nov 03, 2007 11:05 pm
Well I see what your problem is. The tank's way too small for two 4.5 inch turtles. The rule of thumb is you need 10 gallons of tank for every inch of turtle, so with 9" of total turtle length you should have a 90 gallon tank! And....those turtles are still growing!
The filter can't handle the job either. It's designed for a 20 gallon fish tank. since turtles are considerably messier than fish, we usually recommend a filter that's rated for two or three times the size of the tank. What you really need is a large canister filter like a couple of XP3s or an XP4 in a very large aquarium.
If your female's skin is looking unhealthy (and if her skin is grey, it's unhealthy) then it's directly related to the water quality. She will need to be treated for fungus or bacteria. I'm glad the male is still looking good but he won't continue to be healthy if the water quality is poor.
The answer to your question about whether ammonia will cause the turtles to die is that it will lead directly to infections of all sorts that will unfortunately kill the turtles over time. Remember, those turtles go to the bathroom in the tank and then drink the water, as well as live in it. That's why it's so important to keep the water clean.
If you're changing the water every 5 days then that's pretty good except that even with that schedule it's impossible to keep the quality good. There's just too much turtle waste coming into the tank. It's also a whole lot of work for you. I've been through that business of frequent water changes and know how difficult it is. One of the really nice things about having a right sized tank and good filter is that maintenance becomes a whole lot easier for you as well as much nicer for your turtles.
That's probably all kind of shocking to read. Before you panic though, you should know that you can get very inexpensive plastic containers made by rubbermaid that make good habitats for turtles and come in very large sizes. You're probably doing to eventually need a couple of them at the rate your turtles are going but you could start with one 50 gallon one now then add another in the near future. Then, however, you are going to have to have a decent filter, which is a fairly expensive proposition. An XP3 costs just under $100.
Something you can do now is start feeding your turtles in a separate container outside the tank. The container will, of course, have to have water in it because turtles can't swallow unless they are in water. Many turtles will go to the bathroom right after they eat so if you give yours time to do that before putting them back in their tank then it will help somewhat to keep the water fresh longer.
SpotsMama