09-03-2007, 12:47 AM
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O, I think it might be another issue that might just be a thing. As stated earlier, a healthy cycled established tank will eventually smell like a stream, creek or lake. Althought most people do not see this as aproblem, if you have never been exposed to it this can be very disconcerning. I actually have a very clean watery lake smell to all of my tanks and enjoy it but I have had someone come over and ask what the "smell" was that was like they only got when on the river. I never notice it now unless I am doing a water change.
But just to be on the safe side, try this. Take a stick or your hand and slowly move it through the substrate to see if any air bubbles are released. If the bubbles are released and smell like a strong river smell then things are ok but more gravel vacs are needed to combat it. If it smells like rotten eggs, please stir up all your gravel and do at least a 35% water change while stirring the gravel very well. Also, if it is very strong of a rotten egg smell, do not inhale too much! It can actually make you light headed if you have an sulfer allergies or sensitivity. I have only had it happen once, when I got my last batch of Malaysian trumpet snails that all died in the substrate and I about passed out and my eyes burned. The gas is sulfur gas if it has a rotten egg smell and means that food, waste and other things are collecting and rotting instead of being digested by beneficial bacteria.
I also would not recommend UGF unless you want to tear down the tank once a year and do a lot of extra maintenance. That is unless you want to try reverse flow in which case someone will have to explain it a lot better than I understand it.