So i popped my head into the tent last night and noticed a smell of fish, couldn't smell the plants over it, (unless its the plants that smell of fish)

Environment has been consistantly stable the last few weeks. 45-55% RH 18/19- 28°C I did leave some run off in the tray for about 24 hours before i got round to cleaning it out i gave the whole tent a wipe down with some antibacterial wipes before putting the girls back. That was the day before yesterday.
Any ideas what could be causing the smell?
Ta in advance.
God bless.