Need alternative for crushed corals

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With that large of a pH drop, beside adding oyster, shell as RD suggested, I think you should normally be doing more water changes than once per week, they should be larger than 30%, and the filter should be rinsed at least once per week.
 
I highly doubt that the crushed coral caused your issues with your Asian aros tail. Never heard of such a thing, with coral, or oyster shell.

thanks RD :) I've also read a few thread regarding crushed corals and arowana tail, in arofanatics forum, at first i was also quite sure cc wont do that, until i removed the crushed corals .
ive removed cc and added it back a few times already. though my crushed corals are old. I'll try to find oyster shells. in my other tanks i have a few kilos of crushed corals to buffer but no problems with my other arowanas, only this piece i'm having a problem with.
 
With that large of a pH drop, beside adding oyster, shell as RD suggested, I think you should normally be doing more water changes than once per week, they should be larger than 30%, and the filter should be rinsed at least once per week.

thanks, problem is Canisters are hard to clean :) i do notice improvement in my arowanas tail with more water changes. its just wierd that this arowana has problem and my other tanks which have more bio load have no problem, but then again those tanks have sump filters vs this one since this is indoor and our floor is wooden.

btw just curious, how do you measure amount of waste a fish produces?
 
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Interesting. I have never seen oyster shells cause issues with Asian aros. Having said that I agree with Duane, sounds like you also need more water changes (and possibly filter maintenance) to keep parameters in check.
 
I believe the biggest problem with canister filters is that they are not user friendly to clean, and because of this, are not.
Being under pressure does not give a canister some kind of magic power that allows it to need less cleaning than any other kind of filter. This is one of the reasons I gave up on canisters long ago. That, and that parts, and O rings seemed to wear out quickly, and flow compared to regular water pumps, was wimpy.
 
Interesting. I have never seen oyster shells cause issues with Asian aros. Having said that I agree with Duane, sounds like you also need more water changes (and possibly filter maintenance) to keep parameters in check.
oh not Oyster shells RD, Crushed corals. I've ready if the crushed corals are old they have to be changed , Not sure why but did not believe it too before until i experienced it myself .
i'll try to get some Oyster shell to try. will also do more water changes .
My arowana that has the tail problem is about 8 years old :) hopefully still young.
 
btw just curious, how do you measure amount of waste a fish produces?
With a sophisticated laboratory and someone with the right expertise.

For the rest of us, we check that ammonia and nitrite are non existent and that nitrate stays low. The most practical way to keep nitrate low is through water changes and using plants.
 
Based on what I've seen and currently use, the stuff sold at pet stores as "crushed corals" aren't really 100% corals. It's really a mixture of that and other shells. What % mix, I cannot say, but it doesn't appear to be all corals. I don't think this changes anything for you, but wanted to call out.
 
Archie, coral etc should only have to be replaced as they break down over time, to the point that they are no longer keeping ones alkalinity stable. Perhaps that's what people were referring to?
 
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