Hi thank you for your reply I lost another fish today a young one, I completed the 3 day course of Esha 2000 I have done a 75% water change today, Iv put some pictures of what I use when doing water change just fish health optima and ph raise which I gradually increase, I noticed on my white guppy who is my oldest guppy, he has some red scraping dots on his scales, Previously you asked what the plant matter was on the surface, this was just fine guppy fry food, I actually ran out of feed previously so I mum passed me a cheap flake food which I have now threw out as my new flakes arrived from amazon yesterday, aquarium nutrition tropical flake food, I have assassin snails, and 2 Cory Dora and few plant snails I’m keeping on top of, I usually have more fresh plants but with fisheries closed I have not been able to get anymore yet, a question I wanted to ask is if it was a parasite can these still live in snail lava ? Or are they killed during treatment? here are my water details-Now you had another fish die I would water change again. How many fish are left? I would keep on doing bigger water changes everyday this week and then scale back over the next week or two. If the fish are responding positively to water changes then that's good news.
Can we get an update on your tank test?
My water is Ph 6.8 and GH 6 out the tap and I use replenish from seachem to raise the GH, and the above posts are right, the PH follows. I then use an alkaline buffer to raise carbonate hardness to keep it there. You can increase GH cheaply and easily with epsom salts, baking soda and table salt however I haven't gone down this route as I have a easy supply of the aforementioned product. I'm pretty sure that Marine Buffer would likely raise the GH as well, can you confirm the manufacturer? I have tried the shells and crushed coral before and the buffering is so slow I wouldn't go down that route if you need to make a big GH movement.
The water isn't optimal for Guppys if you could get the water to 10 Gh and slightly alkaline that would be better.
I notice there seems to be some plant matter or other material on the surface, what is it? Could you also do a full tank pic.
Can you confirm your normal maintenance process and what you feed?
If you can answer the above we can then we can consider course of action.
NO3- 20
NO2- 0
GH- 8
KH- 6
PH- 7.6
Cl2- 0
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