Ok, here is the info you asked, thank you in advance for the help! 1. the water is the same as it has been, ph 7.6-7.8 76 degrees, 0 ammonia, 0 nitrates, 0 nitrites.. been up for about 3 months., first i added plants at very begining. two live plants... 3 weeks after I added 1 white skirt tetra, then a week or so after 2 more white skirt tetra. all very healthy. Then over a month after that one dwarf blue gourami. these all came from a local pet store ,.. ten gal tank by the way. Everything was still fine. Last weekend whet to PETSMART and got two new plants and this guppy. Guppy was fine first two days, swimming all over. Then monday tuesday he started hanging in the same spot. same this morning... water still looks well. the only thing I did diffently was clean the gravel this weekend. I bought a ball pump gravel cleaner and did a 25 % water change. all the other fish are eating and happy., guppy did not eat.