Have No Clue Whats Happened

[Saramine]

35gal Hex so quite tall
5 black phantoms
2 Platys
1 gold gourmi
1 clown pleco
2 kribs
This set upm has been running unchanged for about 2 yrs Only thing is 2 platys died at the end of may.

So this morning I trimmed back and overgrown plant in my tank. ANd I notice a black phantom tetra with a cloudy eye. I have never had that problem. I tried to net him but no luck so I gave as it was upsetting the whole tank. So I went out a ran some errands 4hrs later I came black phantom is not cloudy all over with popeye as well. I have ick on all the other 4 black phantoms. My 2 platys both have ick and and my gourmi has a cloudy eye. Nothing has changed I cut the plant back and that was it Stress maybe but it was so fast on sick on in the morning now most of the tank has problems. SO I tested the water Here are the results.

Ammonia 0ppm
Nitrite 0ppm
Nitrate 0ppm (Its a planted tank but never this low)
ph 6.2 (Has always been 7.0) No clue why its changed

So some of my numbers have changed. I only add declorinator nothing to change the ph or any thing else. I am I doing a water change at this moment about 30% Hopefully enough to bring up my nitrate for the plant too. And the ph. Is all this just stress I have added no new fish it 3 months. I am looking for suggestions right now what was my hospital tank has 2 bettas and a devider in there. the 15 gallons has a little guppie colony in it. The tank currently has been dosed with melafix because I thought it would help the 1st black phantom. But I have no idea where to go except a water change.

 

[*Fishkies*]

How often do you perform water changes?

Cloudy eye, and popeye often occur when the fish are stressed or there water quality is bad. A bacterial medication will often help clear up the cloudy eye and popeye.

Also ich is brought on because of very high stress in the tank often and new water parameters.

 

[Saramine]

25% every 3 weeks my tap water ph is 7.0. I have no idea why it dropped so far today. But I did a water change and it bought it back up to 6.8. The lowest my ph test goes is 6.0 and it was immeadiatly that color so I thing it may have been some where is the 5 range. until I get this sorted out though I will be test in every day. I have lost 3 fish and everyone looks terrible. At the moment as the is hardly an ick I am trying not to have to medicate. I did a 30% change earlier. And I think is saved one of my fish as it was on its side in my plants when I did it now its hanging out in a corner but alive at least. Here hoping I was almost in tears earlier I have losing fish to something like this. I don't mind old age but death because I screwed up makes me feel horrible.

 

[kribensis12]

do you treat your tap?

 

[bluefire]

check your tap water's ph again, ive had a problem similar to this when my tap water went from 7 to because my water company ws cleaning pipes in the area

 

[-germ-]

Possibly old tank syndrome...
The excess of hydrogen ions released during the nitrification process and built up over time makes for a steep decline in PH....
If nothing else works you'd be best doing 100% in one go (risky) or 200% water change over the space of a week to get things back to normal....

 

[Saramine]

The tap water is currently 6.8 which is a change from 7.0 but not to big last nights water change was more than 33% last nite my husband wasn't paying attention. More like 55%. Only one dead fish this morning one oto. But the platy that was on her sides in the plant last night is cureently swimming around so maybe I am done losing fish. I have to get some more decolor but I wil.l do another change tonight. I never treat anythingwater or anything else. The way my tap comes out is the way it goes in. Except declor.

 

[-germ-]

If your ph is up and down so suddenly i'd still keep an eye on it,and keep up a strict one week daily water change regime. With or without chemical etc. additives(?) your tank can still suffer from OTS.
have a look at this link.
Also i'd strongly reccomend the dechlor in my sig (SeaChem prime) as pretty much the cheapest and best going.....