Trouble is the lower nutrients (the goal of zeo) will cause stn with the alk being so high. As wrangy says it needs to be between 6.5 & 8 . HTH
What amounts are you using? It should be just over double what I use
I'll be using about 400-500ml of stones
200ml of zeo carbon
0.2ml of Start twice daily
2 drops of Bak 3 times a week after the intial loading
And food I'll be playing around with a little bit in the beginning
I also dose 2 drops of sponge power, coral snow 2.5-3ml and 2 drops of coral vitalizer every second day and 2 drops of bio-mate twice a week
I'm also adding 1ml of acropower every day as an amino supplement