Do you know any solutions for these issues? I’m a new owner
a lot of the solutions should be dealt with when the tank is set up before getting a axolotl.
always have the tank cycled before putting any animal in the tank.
always ensure there is adequate oxygenation. even if you are using air-sponge filters the oxygen can still get low, this is because large air bubbles don't dissolve as easily as small bubbles so having a air-stone is essential.
axolotls originate from slight brackish moderate to hard water, it was found that certain salts and minerals are required to keep axolotls healthy and active, this solution that was created for this purpose is called holtfreters solution, there are varients to this solution called modified solutions, the information on these can be found at
Axolotls - Requirements & Water Conditions in Captivity
whilst the weather is cool plan how to keep the tank cold in summer months, this can be by putting insulation around the sides and back to reduce changes due to room temperatures. using fans to blow over the water causing cooling due to evaporation, although this also requires frequent topping up. using a old fridge freezer and piping to cool the water down, this is done by pumping the tank water through piping that is coiled in the fridge and then back into the tank. using peltier chillers, this uses a semi-conductor that produce heat on one side and cools on the other, although effective these are only really suitable for low capacity tanks. chillers these are the most effective but also the most expensive option, these work on the same principal as a dehumidifier but without the warm up stage that a dehumidifier uses to collect water. this last one is the ice bottles, this involves putting clean bottles full of frozen water into the tank water to cool it down, this is ok for emergencies but causes temperature fluctuations that can become more stressful for the animal, it also requires a continual supply of ice bottles as to keep the water constant the bottles need to be replaced as they defrost.
water changes on an aquarium should be done weekly, this is done to remove any nitrates in the water and any waste in the tank, the % of water removed is the% of nitrates removed, unless the tank is a very large one in which case a sump is best to be used to remove waste and nitrates, or the tank is heavily planted in which case only minor clean ups/water changes are required,
axolotls don't have eyelids and are mostly nocturnal, this means they don't like light and they also require somewhere to sleep/rest during the day such as a hide or cave, this can be anything from gutter pipe/blacked out jars/slate/ornaments , bare in mind these need to be able to fit a one foot or larger axolotl. always be careful of adding anything that isn't designed to go in the water as it can leach toxic chemicals that can be in the paints/coating.