how do you go about keeping the tank cool? a lid shouldn't be of any issue.
also, we need to know your tamk parameters. not having them in the right range or not knowing them at all can and will kill your axolotl. knowing the water temperature is also paramount, as warm waters can be deadly to axolotls.
your filter is probably creating too much flow for your animal, but you can attach a sponge to the outlet portion of the filter to mitigate this.
honestly, i get the impression that you're a little kid, and an unprepared one at that. there's a lot of research that needs to be done before getting any pet, especially one as tricky as axololts.
i encourage you to ask questions, and reply to this thread. if you want your axolotl to be happy and healthy, you are going to need our advice.