I got 6 of them in a 29 gallon with 5 ottos. The serpae are CONSTANTLY nipping at eachother but wont dare to touch the ottos, or even recagnize that they are there. I was wondering if it is ok that they are doing this. They arent doing an damage to eachother at all but it would be extremely stressful to have someone poking me 24/7. what should i do? also When i put my fluval filter tube above the water, the bubbles it makes stay at the top of the water and dont pop. I made a 98% water change the other day ( I moved so I had to drain the water, it is well cycled as it has live plants and the gravel is uncleaned from before). thx