Setting up a few new tanks currently, and researching stock options. Have a 55 and a 150 tall cycling without a plan for stock yet other than aquscape. I do want to do an axolotl tank for sure. Questions are, will a 55 be enough? I've seen the recommendations roughly equal to fancy goldfish for stocking limits so I'd figure 3 would be a good number. Also I've seen the temp requirements, our house is normally kept at 74° in summer and 64° in winter. Would a chiller be required for the summer months? They are quite an expensive investment so I want to be sure I have the proper environment.