Ph..............sky High

If your tank is cycled, most of the bacteria will be in yuor filter media. So if you have no fish in there, removnig the gravel won't ruin anything :thm:
 
I don't think changing the substrate would mean totally re-cycling your tank as you have cycled filter media. If you are keeping fish in the tank after substrate removal/change, I would do some frequent water changes until the amount of bacteria levels have time to play some 'catch up'.
 
Ok then, is there an alternative to changing the coral and what problems will it cause for a fish with a ph that high and yes there is already fish in the tank.
 
you should change out the coral ONLY if the pH difference between the tap water and tank water has a negative impact on your fish. if this pH differential hasn't impacted your fish by now, i'd not worry about it.
 
I would suggest slowly changing the crushed coral for gravel. If you remove a bit of crushed coral (1 cup) daily and replace it with gravel I think you'd be fine. The problem isn't really removing the crushed coral, it's its effect on the water parameters. Just keep testing the parameters and make sure your KH and pH never change too drastically in a day.
 
Well folks over the last couple of weeks i have gradually changed the sand and coral for gravel and guess what??????????????????




Yep................ it done the trick!!!!!!!! :dance: :dance: :dance: :dance:

My ph has dropped back to a steady 7.6 and i've got the happiest Fahaka Puffer in the land.

Thanks for all your help and advice
Hope you all have a great christmas folks
Thanks again
 
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