About my set up:
75 gal freshwater, filter is aqueon quietflow 75 400gph using carbon and mechanical fliters set up for 4 years
Ammonia is 0 ppm, Nitrate is 0 ppm, Nitrite is 0 ppm, pH is 8.0-8.2, temp 80 degrees.
My fish have never been healthy, no matter what is in my tank at the time. I buy them from a very reputable fish store and they all get sick and die within a year. I am frequently treating for bacterial or parasitic infections (most often ick, fin rot). 4 years of this and I'm about ready to give up.
I do a 30-50% water change every 1-2 weeks, vacuuming every other time. I use stresscoat to treat new water.
I feed new life spectrum community fish food, 1-2 pinches a day and an algae wafer every other day, no recent changes to diet.
I did add new artificial plants in December but the fish were already looking sick before that. My fish are basically perma-sick.
Current livestock:
1 Bushy nose pleco - 4" he is my oldest fish being 3 years old.
1 Turquise rainbow - 2 1/2", I've have him for 9 months
1 angel fish - 5", had him for about a year
1 electric blue acara - 3", had him for about a year
1 yoyo loach - 2 1/2", had him for about a year
1 electric blue ram - 3/4", got him in November (Added paraguard to the tank when I added him)
1 assassin snail - had for a few months
lots of tiny trumpet snails
In October, fish had been symptom free for 2 months so I added the ram and an assassin snail to deal with my trumpet snails. When I added them I removed the carbon and dosed the tank with paraguard for 6 days. The rainbows (I had 2 at this point) and the acara had clamped fins and were paling in color, yoyo loach was also paling in color and the rainbows were swimming against the filter current at the top of the surface.
A week later I noticed ick spots on the acara and rainbows. One rainbow (the one who I still have) had his jaw stuck open from the lesions. I treated with ich-X doing the appropriate water changes and lesions dissapeared. Acara remained pale in color with clamped fins, rainbows improved in color but kept swimming toward the stop of the tank against the filter current.
Acara faded in color until he turned basically white and red at bases of fins and around gills.
A week later, one of the rainbows who had seemed to be improving died.
Remaining rainbow is dark in color but fins still clamped and swimming against filter current. Acara is white with red at base of fins and around gills, dorsal fin appears to be wasting away, he lays at the bottom on the tank and is not active, does not appear to be eating. He's been like this for 2 weeks. Angel, Pleco, Yoyo and ram seem fine.
Removed carbon and started paraguard 3 nights ago and did a 1 hr dip in paraguard for the acara. No improvement noted.