Fishes are a little complex, some species are really easy, just give food and be done with it. Others are really specific, they need special equipment and you need to even balance the water pressure. They need almost the same effort as cats and dogs
Tarantulas dont need much care too just feed them and thats all. They dont have any sounds and they dont smell. That blue one got away from its enclosure once, it wasnt a good memory I also had a snake gotten away from its cage and if I couldnt find it before it was seen I would be a dead guy by now I dont have any pics of it online but it was a cornsnake but changed it for a gecko

Also please share the pics when you have time lol. I love cats!