Why is my small musk turtle not eating or growing with its tank mate?

Separate out the aggressive one. It could be nipping due to hunger, stress or aggression. Consider hand feeding to avoid accidental bites as well as dividing them into two tanks to provide more space. As they mature, they will require a significantly larger space. This number of turtles ideally will need a tank in the hundreds of gallons range or a small pond. A general guideline is 10 gallons per inch of turtle. Sexing turtles is easier when they are mature. Without knowing the species, it can be difficult, but in general, females are larger than males. Males have a shorter, thicker tail in comparison and usually have longer front claws. A female will have a flat plastron whereas the male will have a slight concavity. Males have a v-notch at the rear of the carapace to accommodate the tail when mating. Lastly, you can check the cloaca, or vent. Females will have a rounder vent closer to the body whilst males will have more of a slit farther down under the tail. All these differences are best seen when comparing two turtles or a proven pair.

Thanks for your question about Bolt. Having multiple turtles together can lead to some problems, as males can be aggressive to both other males and to females, depending on the time of year. Males don't tend to get along with each other once they hit sexual maturity, and you may end up with injuries or the need for two tanks. Males will typically only be aggressive to females in the breeding season, but the same issues can arise depending on how aggressive the male is being. As far as determining sex, it is difficult to tell visually what sex they are until they are a bit older and getting closer to sexual maturity. There are other techniques that can be utilized such as endoscopic sexing, however you would need to consult with a veterinarian to have this procedure performed. I hope that provides you with some information, and often turtles will do quite well when they are kept alone.

Juveniles smaller than about 4 inches are difficult to sex. Once they reach that size or larger, it is quite simple.Female sliders are larger, have shorter front claws and thinner. smaller tails than males. Males can be territorial and could "argue" if the tank is not of sufficient size. Ideally, you want to allow about 10 gallons per inch of turtle. Sliders can get big (12 inches fully grown), so be sure you have the space and budget for a large tank.

Symptoms of illness can include lethargy, decreased appetite, loose droppings, discharge from the eyes, nose or mouth, swimming crooked, difficulty breathing, wheezing or popping noises while breathing, swollen eyes, or blowing bubbles from the mouth or nose. Ideally, you should provide 10 gallons of water per inch of turtle. Keeping a hatchling with a larger turtle would not be recommended for the safety of the hatchling. The 10 gallon tank would be fine for the smaller turtle temporarily. Maintain a water depth of no deeper than twice the length of the shell.

I wouldn't recommend keeping a smaller turtle with a larger turtle. Oscar would harass or try to eat the smaller turtle. Red eared sliders can be quite territorial and aggressive towards other sliders. If you have a huge tank, say over 100 gallons, it *may* work. If you are set on having another turtle, look for one that is similar in size. The problem with mixing species is that there may be care and environmental differences that you may not be able to overcome in order to provide adequate care to both species.

Thanks for reaching out about Sebastian and including pictures. Points of interest to investigate would be: (1) heat support in the water, (2) nutrition, and (3) water quality. If the water temperature gets too low, turtles will slow and stop eating (acting as if hibernating). The water quality needs to be kept clean to decrease bacterial and algal overgrowth. Regarding nutrition, the package of pellets needs to be changed every 3-4 months as vitamins degrade quickly. Offering diced vegetables and whole fish (goldfish, tetras) can provide exercise and nutrition. If Sebastian remains quiet and lethargic, a visit to a reptilian veterinarian is recommended. Good luck.

Males have longer front claws and a longer, thicker tail. Determining sex can be difficult in turtles measuring less than 4 inches. Consider separating the turtles until the smaller one is larger. Sliders can be quite territorial and a larger turtle may injure a significantly smaller one.