I have a 38 Gallon Tank with 2 Dwarf Gouramis, 2 Corydora, 2 Angel fish, 4 Danios, and about 8 Female Guppies. I'm running an Aquaclear 50 UGF and a HOB Aquaclear 50 filter. I added the two Gouramis about 2.5 weeks ago. They were very peaceful with each other. The last week it seams that the...