Wasp;
Had a good talk with Brendan about all your suggestions, answer<> yes to all (Thanks for that.) So up start to twice a day, getting more rock posted
start changing monthly till things clean up and I bought a timer in town today to do the 3 on 3 off.
Just gone on to new carbon Brendan said the brand I was using tested possitive for phosphates, bit of a blow I used it all can't test it know running a test on new lot seems ok will check in morning.