If you are determined to keep them, then you need to commit to treating them right. If you cannot perform a weekly water change for them, then you should give them to a fish store so they can go somewhere with a proper home. Changing water in a tank that size should not take more than 15-20 minutes. Is that really such a huge burden?
Also, like I said, they need more places to hide. These are fish who startle easy and need a place to hide until they can feel secure again. An open space at the front of the tank closed in on one side is not enough of a hiding place.
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