I have a 250 Litre tank, nitrates are about 50-70 ppm
, our tap water is 50ppm so getting lower isn't feasible.
Nitrites & Ammonia is at 0ppm, Ph is in the high 7's and my water temperature is 26.5c. Really can't see it being oxygen related as it's been fine for months with 2 large airstones, 1000lph spray bar & 1000lph power head moving the surface. Substrate is sand.
Tank inhabitants seem to keep dying at a rate of 1-2 fish per day, it started when I added a pair of Dwarf Gourami, one of which died 3-4 days later.
Zebra Danios are hanging around looking like they are constantly nibbling & some are red around gills & anus, also lost some Kuhli loach, many of which look like they are gasping saw 2 last night sat on top of the powerhead with their heads at the surface, 1 is dead this morning, some of them when i can see them are red around gills.
I've seperated what I can catch into a hospital tank of the Danios & Kuhli, one Danio had his eyes go funny, like white blobs then die & one now has tattered tail but is still wimming.
A friend suggested a parasite med called Praziquantel i think it's called, 1st dose went in 15 hours ago. I have Vampire & Amano shrimp so options are limited.
Anyone else got any suggestions?
So far the shrimp and Otto's in there seem unsffected, there is also a Green Phantom Pleco and he is still doing his thing for now.