Yes it has been up 2 mths, Plus I used Fritz 7, and I put 8 skirt tetra, 4 blk 4 white, I'm down to 3 each. And it had been that way for 3 weeks, also had 4 Cory cats that has been doing great. I check water all the time it's has been good, I do water changes bi-weekly regardless. I lost 2 more...