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That really does seem cold for guppies. They might be alright in cooler water for a little while if you have a power outage or something but 69 seems cold for long term.
Addison I am so sorry for all your losses...it will get better...don't give up...fish keeping is a big learning experience and we all started from somewhere....take your time ..sit back...take deep breaths.....plan what you want your tank to look like and the residents that you want residing in the tank...then research every ounce of what you want and need....ask questions beforehand....many of us have made mistakes and experimented.....good luck