I have a 29G standard. Tahitian Moon Sand, Bio Wheel 170, with lots of fake flora. Fauna wise I have 3 adult female guppies(used to have 5), 5 dwarf puffers (they never nip), 5-7 ghost shrimp, 1 CAE
. and one clown loach.
Water clarity is always perfect. No smells of discoloration/cloudiness.
They eat flake 2x daily and blood worms 1x daily.
I add 1G a week for compensation of evaporation. I do not own a water test kit, as I have yet to need one, although I fell like I am about to be lectured for not owning one.
The problem started about 4 weeks ago when I found one guppy dead at the bottom of the tank. She was emaciated and colorless. I quickly removed her and did a 1/3 water change. Two weeks later I found her sister dead at the bottom, this time no color change, but she was horrible distended, (huge belly). Deffinatly not pregnant distended, but scales peeling off distended. Today I noticed another of the guppies is hugely distended. Same thing, scales peeling off, and about a 150% gain in circumferance. She is still alive, swimming and eating.
All other fish are fine with now obvious signs of distress.
Of note: The dwarfs have only been in there 3-4 monthes, so the blood worms feeding is new to this 2 year old, well established, never problematic guppy tank.
Feel free to stone me for having a water test kit, but I have never had a problem in two years.