I have not heard anyone discuss your feeding/schedule. How much/often are you feeding? This can have HUGE impact to the ammo being produced especially considering nothing is removing it but WC's. You should seriously consider reducing feeding if you have not already.
I agree you should put the fish in the 125 with the current filters. The waster volume alone will displace the amount of ammonia until you tank cycles and potentially save your fish. You will need to obvisouly add much larger filtration in the near future but it can't be worse than that much ammonia in 30 gallons.
I agree you should put the fish in the 125 with the current filters. The waster volume alone will displace the amount of ammonia until you tank cycles and potentially save your fish. You will need to obvisouly add much larger filtration in the near future but it can't be worse than that much ammonia in 30 gallons.