hey i have had FBT for a few months now and it seems that no mater how well i clean there is always a oily surface on the water.
i completely change the water every 3 days and wash the river rock once a week. the oil seems to go away for the first 2 days after cleaning (its still there just hard to see), but it comes back and is very noticable on the 3rd day on.
are my toads secrating something to make this happen or whats going on? it doesnt seem to be bothering them but it makes my tank look awful. thanks