Honestly, I have a pile of concerns - one of them being what that tank is sitting on, it looks like it's too small, and there is quite a bit of tank hanging over the edge on either side.
In addition, it's quite possible that the tank hasn't been running for very long, but also the fact that you have had to add an anti-fungal to the tank already is concerning.
So..
1) How big is the tank
2) What do you have in it fish wise
3) Can you find something better to put the tank on so it's not hanging over the edge of a table
4) How long has the tank been up and running
5) What are your readings for nitrate, nitrite, ammonia & PH
6) How often, and how much water do you change
7) Why did you need to add the anti-fungal