I have a 30 gallon tank with the S.Sanchezi Pirana. Its been operating for about 3 weeks now and everything is good. My question is the water looks clear and everything, but I can see hundreds of microbubbles, or something along that description. I have the proper power head, an aerating oxygen pump, and an aquaclear 150 filter. My hunch is becasue of the equipment and tank size, these are oxygen bubbles. I am unsure but want to know right away, I also dont use any chemicals other then the chlorine remover and cycle, I only use half the recommneded and know its not chemicals. Can anyone clarify this situation, I can provide pics if needed, but Im pretty sure its just oxygen.