Hell’o all. New member here. Hope I’m posting in the right place. So I need to keep my bio filter going with out fish for a undetermined amount of time. Not sure the best way of doing that. Tank background. Freshwater 36 gallon running for 13 mounts. With good results. I have rehouse all fish after mail ordering incomparable stock. I was told they would ship 12/30 overnight. Fish was removed 12/30. That same day at 11pm I received an email saying my shipment was delayed until they are restocked. So I find out at 11pm the night before I was to receive new fish there not shipping. With a wasted day off today 12/31. Trying to figure out what I should do. Any help is appreciated