Please help!!!!! I have had this problem for a good week and have been doing water change's,vacing.They were at a 40 but now have come down to a 20 but I can't seem to get them down any futher.I bought some AmQuel plus yesterday to help with it.I have lost 3 fish within a week.
PLEASE can you tell me what i need to do.I have a 10g,temp80-82,ammonia 0.25,Nitrate 20,Nitrite 0,PH 0.My stock I HAD was 4 guppy's,1 Bumblebee goby,1 cory,1 Neon tetra.......Now I have 1 guppy,1tetra,1bumblebee,1cory.I feel like I am missing something or just not quit doing something right.If someone could tell me what to do I would app.it sooooo much! 

