What kind of filtration do you have on the 30? When I had to move our 55g tank I had a lot of big fish crammed into 2 10g tanks, and it turned into weeks... I had bought the huge HOB
filters from walmart, I think they were whispers made for 30-60g tanks, 2 sides of carbon and alot of GPH
for small tanks, although you can adjust the flow, I placed rocks in there to divert and disburse it. I had that running with both sides carbon doing water changes as needed... but I rinsed the pads every week in clean SW
as well. Cut way back on your feeding ... that can reduce a lot too.
Sorry I have never had to do the Hypo so I'm not sure about that.