DSwofford

I have a 125 gallon freshwater community with 7 gold dust mollies, 4 blue paradise, 4 swordtails, 1 angel and 1 pleco.
My blue paradise are currently fighting over the plecos algae wafer (nothing unusual) but they all keep swimming to the surface to get what appears to be a gulp of air, then they dive straight back to the bottom for about a minute, then they come right back up for another gulp over and over. They are the only fish that are doing this, none of them appear in duress and are all acting normal.
My water temp is 79F
ammonia 0
nitrite 0
nitrate 20

Any ideas?

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DSwofford

Two males two females. They get along pretty decently, but I'll be sure to keep an eye on them. There was supposed to be 1 male and 3 females but I'm pretty sure I have 2 males.

I do 25% water changes weekly and vacuum the gravel when I do.

I have 1 lone live bamboo plant in the tank, the rest are fake. Someone told me that bamboo will die if fully submerged, but my LFS said it would do fine, so far it's been in there 5 months and looks as nice as the day I bought it.

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