Being the kind of tank it use to be, He deffently caused a big cycle, there would be soo much crap in that sand bed, and he never had the issues before becouse he had 3 times the water volume so it was diluting it for him... What are his nitrates at? anything above 50ppm i would remove all the fish right away., anything less they have achance..
But a move that big.. he could be looking at up to 6 months..
When i moved from a 220 to a 90 i had the same issues.. 2 year old sand bed! .. moved to the new tank and it took my tank allmost 4 1/2 months before the water was compleley cycled to add my fish again!
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