Hello, I have a 30 gallon tank with three seahorses, mandarin goby, 2 turbo snails, 2 nassarius snails , 2 margarita snails, 2 hermit crabs, and two cleaner shrimps. I also had a diamond goby in there, but he passed away this morning. I believe it would be from starvation because the seahorses and cleaner shrimps would basically eat everything although I would put food close to him. He was never active since I got him(which would be two and a half months ago) and would never sift the sand bed. Before he passed my ammonia was 0 nitrite 0 nitrate 40, and ph 8.1. I checked it this morning and my ammonia was at .25 nitrite .25 and nitrate off the charts then I seen him under some rocks not moving or breathing. I know a water change would be necessary for this, however the fish store I would go to for saltwater said that they cant make any until tomorrow. Well tomorrow I cannot do a water change since I will be out of town. My question is would my tank be fine until Saturday? I also have prime I can apply to my tank?