Ranchu not eating in Green Water Options

[Chinmo]

this 2 ranchu that can be seen in one of the pics used to be eating quite alot, but after transfer to my green water setup they eat a bit only! what's wrong? the green water not right?

ph for green water is at 7.0, temp at 29.4'c ... do not have ammonia test kit, gonna get one tomolo....

any advices? abit confused abt green water liao.....

oh one of the ranchu ganna red veins in the fin when she was in the clear water tank......



The other end of the connected green water setup, the filter is use to filter bulky waste!




These 2 shubunkin was used to clear and clean up uneaten food and stuff at the 1st tank , damn active! and eating like pigs!