I have had my 29 gallon tank set up for about 8 or 9 months now:-
30 -35lbs live rock
Aqua C Remora Skimmer
A Magnum 350 running with carbon and Phos-X
A 65W (maybe more) 50/50 compact
A maxijet power head
All of which is called home by:
~15 hermit crabs
A cleaner shrimp
a soon to be traded coral banded shrimp
and a pair of conchs (fighting)
A bubble coral
a bunch of Xenia
A nice flourishing Green Star Polyp
A growing hammer tip coral
and a sebae anemone (yeah I know, but we were all young and impulsive once!)
After it cycled, I have had perfect readings on nitrite and nitrate readings of only 10 ppm
at the very highest. However, the past three or four months I have seen a constant background level of ammonia, which I am unsure of how to bring down to 0. It never gets above .25, but it used to be 0 and I am worried that I might lose fish because of it.
What is the likely cause, what can I do to change it, and why if there is excess ammonia around do I not see it passed through the cycle with elevated levels of nitrite and nitrate?
Thank you so much for your help!