Hello. I noticed my 54l aquarium start to leak after taking out all the gravel and cleaning it all, then putting in the new gravel and redecorating. It was okay before, but started just after the whole cleaning thing, so I'll assume I did something wrong while cleaning. A puddle forms at the right side of the aquarium. After I clean it with a cloth, it doesn't actually leak in the daytime, but I see the same puddle again after I wake up, so it only leaks during the night? The carpet thing under it is wet all the time too, it worries me. It's really upsetting, I had the tank for more than two months now, but I guess it's good that it happened before I could buy any fancy fish..