Congrats on joining the hobby! For hides, I find large terracotta pots to be invaluable (my Izzie can usually be found hiding out there) in addition to you tiles
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Some other ESSENTIAL things to have;
1. Turkey baster- for waste spot cleaning.
2. Large, fine net- For clearing up muck and catching axies if they get sick/need to move out for a bit.
3. Large buckets/ water drum- For doing water changes. Good ones are the old water holders from those coolers they have in the doctor's surgery, or the massive 20L ones that are around for camping.
4. Thermometer- Good to know what is happening with your tank's temperature, and to ensure that it doesn't go above 24C (not that it does that outside...)
5. Frozen bloodworms- Keep them in the freezer in case your worm population runs out (As mine have...run out of the compost parts I can reach and into the depths of the heap...)
6. 3+L locking container- if your axie gets sick, you can isolate them in one of these and get them into the fridge so they have a chance to recuperate
7. Surgical grade scissors- Great for cutting air line, plants, etc...
8. A good vet- Verry hard to come by for axie lovers...even Sydney only has one who is remotely knowledgeable about such cuties.
9. An understanding family- there will come a time when your kitchen table will be covered in axolotls, and they will be holding one (or two or three or four or five...). Best to make sure you've got one (I'm lucky my mum's accepted I'm not giving up on the axoholicism, as she was the one holding the scissors when we were treating one of mine last night...)
10. Hope- There will be times when things will go crazy- your ammonia cycle will crash, there will be a few axie illnesses, snails will invade your tank, the power will go out for days... But just have the knowledge that we'll all be here for you when things go south, and we'll be more than ready to help you as best we can. There will also be moments of adorkableness such as an axie watching The News with rapt attentiveness, them following you around as you move about the room (As much as they can within their tank
, them begging for food (Even if its your dinner...). I hope you get to cherish a hundred thousand of those moments, and you get many many years of enjoyment out of inviting these peculiar little creatures into your life <3
Welcome to the axoholics!