CRS tank high ph

Typically, amazonia I soil should bring down the pH pretty much, may I know what are the filter medias you are using in the canister? Can you try to take alittle (maybe a small cup) of the soil out and test it separately in a small tub of fresh water without any other components and see if there's any difference?
If the pH is still high, then you may have to change to another type of soil that is more effective for your water. Trying to control water parameters manually by having to add other solutions is not easy and may not be sustainable in the long run.

I use there media in my filter
Fine filter pad

Coarse filter pad

Substratpro

Ehfimech

I will try to test out the soil and see what happen.

thanks....

[Hobbes09]

Originally Posted by Koji™

Yes, boiling can remove alot of the colouration effect. Will not remove the ph lowering ability. The leafs actually rot in our tank in order to lower the ph further.

But won't it bring up your ammonia/nitrates as it rots?

[Koji™]

Originally Posted by Hobbes09

But won't it bring up your ammonia/nitrates as it rots?

It's not gonna be a huge amount. And also your filtration should be able to handle that little bit of ammonia released.

Originally Posted by n4y28r

I use there media in my filter
Fine filter pad

Coarse filter pad

Substratpro

Ehfimech

I will try to test out the soil and see what happen.

thanks....

Your medias seems to be fine. Personally, I am using mostly Amazonia II mixed with alittle Gex soil and my pH was typically 6.0 - 6.3. Now after about a year and with addition of some rocks (and other nonsense) it is still maintained at about 6.7-6.9. So my experience with Amazonia soil is that it'll bring pH down pretty much and is quite stable after proper cycling. I believe CRS are quite sensitive to water parameters so it's better to achieve suitable and stable water condition right from the start to avoid future problems.
Good luck

I put my crs in the tank about 4 weeks..3 died. They loose a lot of white color. The originally looks very white in my old 20 gallon tank. Still can't lower my ph.

[bps11208]

Have you tried other test kit?
Maybe your test kit is faulty

Originally Posted by bps11208

Have you tried other test kit?
Maybe your test kit is faulty

I use both the API and the digital ph test kit to test it. It's all the same result.

I have about 5 to 6 new born babies in the tank for about 3 weeks...they still alive and grow a little bigger. It's amazing. I thought they would die in a few days when I see them hatch. tank setup for more than 2 months,,still have yellow water..sad

Originally Posted by n4y28r

I put my crs in the tank about 4 weeks..3 died. They loose a lot of white color. The originally looks very white in my old 20 gallon tank. Still can't lower my ph.

Actually, I am also not an expert, but I really think that pH 7.5 is too high for CRS especially higher grade ones. I did experience similar situation like you where they keep dying after a few weeks even though the water parameters were quite reasonable. In my case, since there wasn't much shrimps left at that time, I topped up new soil that has been soaked in clean water for a few days slowly into the tank to replenish the pH reducing effect. Left the tank to re-cycle with some addition of liquid BBS for a few days before adding new lifestock. It worked well for me, though I am not sure if that is the best method.
As for the whiteness of the shrimps, I think it has something to do with the GH and KH of the water too. There's some mineral powder / liquid that you can add to help with that.

Originally Posted by n4y28r

I have about 5 to 6 new born babies in the tank for about 3 weeks...they still alive and grow a little bigger. It's amazing. I thought they would die in a few days when I see them hatch. tank setup for more than 2 months,,still have yellow water..sad

Not sure what grades are your babies, but typically lower grades and those born in the same environment may be more tolerant to the water parameter as they should have acclimatised to it.

Cheers