curing time for concrete ?

[rob1984]

How long do I need to wait for cement to dry before adding it in my tank, it isn't very much maybe the size of a tennis ball and I'm going to fill a log with it to make it sink but was told it mess's with the PH level.... How long should I wait before adding it ??

Would a tennis ball size make that much of a difference with a 130g tank ?

 

[dhardwick]

I would let it cure at least a week try covering it in aquarium sealant then it shouldn't effect your Ph

 

[rob1984]

yea it been sitting for like a week, now i have to re submerge the log to get water logged somewhat... apprently i didnt pack enough concrete in the log hahaha should sink once it get some water back in it, as it was holding alot of wate rbefore after it beig outta the water for a week to dry/crue the cement it now fairly dry lol