long time no WC, how now?

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Bigair

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long, I mean for 3 years, some strange algea keep coming out, and now GHA take over. my fishes and corals are growing good. but the tank itself seems quite dirty.

now I have setup an AWC system thanks for 1 timer relay and 2 dosing pumps, tested works quite well.

the quetion is how can I set AWC frequency and volumn per WC, like

1%/day,
2%/day
10%/day

10%/week
20%week

20%/month
30%/month
50%/month

by start, should I do a 20%-30% or 50% WC to make a quick fix of water quality?

what would you suggest? OMZ
 
yesterday I have done a manually removal most of visible GHA and part of borden sand
 

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