4 years ago I started my fish journey and I have been getting bigger and better fish. 2 years ago I got Into collecting African cichlids I only hada few at first then one day at work my boss invited me to their apartment and there they had a huge collection of their own African cichlids I told them that I collected them too he said that he is trying to get rid of them because they were getting to much for him ( he's 87) I offered to take them. for the past 8 months they have been doing great breeding and living well. On the 27 of January my mother passed away and since then I haven't had time to do a water change or clean the filters well 2 days ago I woke up and found that 20 of my fish had died there were 4 left and the babies. I have no idea what happened. If anyone could tell me what might have happened I would really appreciate it. I would like to add that I am not going to restart my rank back up I'm going to college next year and and it just wouldn't make sense to restart it if I can't take it with me. So I would like to know any trick you all might have for keeping an empty fish tank up in an Attic that has drastic temp changes. I would like tips on keeping the silicon from drying and the rubber seals on the filter. Something that is safe for fish when I do restart the tank. Thank you