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Yes, leave fish in there. Make sure you match the temperature as much as possible and use dechlorinator. During cycle, at the nitrite stage try to avoid such a large water change because you remove the nitites necessary for Nitrobacter bacteria to develop. Also, I would move into new tank any rocks, decorations, some (not all) filter media from the old tank, to try to "seed" it and speed up the cycle.
 

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I think that your 30g is a better choice for the angels. Lack of nitrates could indicate loss of cycle but it could also be the plants using nitrates since ammonia is not there. Even a mini-cycle is better than a full cycle with 8ppm ammonia.
Changing water too much, too often, while good in an emergency, will only delay the cycle. Nitrosomonas need ammonia and Nitrobacter need nitites in order to grow and multiply.
A fish going thru a cycle, even if it survives, it is not expected to live its full lifespan. The gills are burnt, eyes are cloudy, sometimes the fins will grow deformed (in Angelfish, the dorsal fin will bent backward)
 
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