Parameters: 33 gal. Tank. Ph: 7.4. Ammonia: 0.50. Nitrites: 0.50. Nitrates: 5. did 25% water change yesterday. I have 6 Tb, 11 tetras, 1 pleco, 1 albino rainbow shark. Tank has been running 3 months and has been cycled. Gravel substrate, 3 hidey holes, 2 plastic plants, and a few live plants. So I have a question and I have not had much luck finding an answer so I have joined this site. I've had my tiger barbs since 1 week after setting up my tank and yes I do know now that I should have let it cycle first without fish before putting them in there. Luckily I have most of my tb and tetra and pleco from when I added them only lost 1 tetra and a couple tb the TB were actually sick when I got them unfortunately and I didn't know till too late and no idea y 1 tetra died I suspect my red tetra bullied it. N e ways to my question y do tb hang out at the surface? My babies appear healthy are eating and not being bullied. They have done this since I got them. I don't think there's n e thing wrong but if there is i would like to know. It looks like they just like the bubbles. They'll do it for a little bit then swim around or hang out somewhere else