planted tank problem...need advice

[buddah101]

I have a 20 gallon planted tank. It's been running for almost a year and is cycled as far as I can tell. The only reason I doubt this is because that I am having a continuing problem with ammonia. My test results are as follows:

Nitrite~ 0
Nitrate~ 5.0
Ammonia~ 1.0 +/-
GH~ 2 / 35.8ppm
KH~ 1 / 17.9ppm
pH~ 6.8-7.0
CO2~ (aprox.) 4.755pmm

You see the problem? I do regular water changes and keep pretty good tabs on things but I just cant seem to find the problem unless it is decaying plant matter that I cant find? I know that my tank is not over stocked cause all I have in there is a Farlowella vittata catfish and a Bolivian ram. As for filtration I have a whisper mini with floss in it (junk) and a 606 minijet pump (I put floss between the intake and glass, also I run the CO2 line into the flow deflector).
I use a D.I.Y. CO2 generator (3 litre bottle)
Ant suggestions?
Oh, my tap water checks out too so thats not a factor.

 

[piranha45]

how long have you been getting these ammonia readings for? that does seem pretty bizarre.

 

[rayman45]

try throwing another little filter on filled with ammonia chips

i did that on my 20L, it always had the ammonia problems stoped after 2nd filter

 

[buddah101]

ok, I'll try it now. Thanks!

 

[guppy]

try adding a 10g under gravel filter

 

[Corydoras]

Trying passing through your water with zeolite stones.

 

[SandNukka15]

First thing u should do is test ur tap water and see if it has amonia levels that high