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Pure strains only. No guppy crosses. Thank you.

I recently bought a large Universal Rock outcropping as the centerpiece of the new tank. These artificial rocks are hollow inside, and the only opening is the bottom plane that rests against the substrate and/or aquarium bottom. I'm concerned this may create a problem with either trapped air...

I recently purchased a 20 gallon long Marineland aquarium. After filling the tank, I measured the ends and middle to find out whether there was any bowing in the glass. I measured 29.4 cm on each end (front to back) and 29.7 cm in the middle (again, front to back). This appears to be a 3 mm...

I noticed this egg today floating among hornwort in my tank. Inhabitants include assassin snails, otocinclus and corydoras. Google searching leads me to believe this may be an oto egg. These fish have been in the tank for about a week only, however. They adjusted well and appeared to acclimate...

Can anyone tell me what type of algae I have in my tank, based on the pictures attached to this post? If so, how do I treat it? I have slowed much of the growth by changing feeding routines and photo periods. However, manually removing the algae seems nearly impossible. Thank you. Sent...

Boy or girl?

My GBR developed a white spot on a fin about three days ago. No other spots have developed on this fish or others in the tank. Today, it appeared that the size of the spot has increased. Attached is a photo (the photo is if the fish's backside, and the spot is on the right side of the fish)...

I noticed these eggs on a piece of shale yesterday. By my count, there are 12 total arranged in neatly lined clusters of three or four. Known tank inhabitants include pond snails, ramshorn snails, trilineatus cories and pygmy cories. Any ideas what these could be? Sent from my iPhone...

Hello, everyone: First-time poster, longtime reader. Thanks in advance to those who take the time to read my post and to those who offer advice. We have a male crown tail betta in a 10 gallon, fully cycled tank (0,0, 10. pH 7.6). We've had him for one week, and he's been doing apparently well...