I just did a 25% on Saturday, and a 10% change on Monday. I checked my parameters, and they all seemed normal. Nitrate and Nitrite were at 0 ppm, and ph was about 7.5. My tank has been running about a month and a half now. I've had neon and glolight in it the whole ride until it evened out, then I got my pleco in it. I recently had a dwarf gourami die similarly, (jerking about, spasming), and I waited, then bought a new fully adult Blue Gourami and new plants. It is now heavily planted (check my tank pics on my page) and I have zero aggression. It is a 30 g and I have a 5 gallon with a Betta with 2 month old water. Should I move the pleco in to the 5 g until he chills, or what?