hes just checked his parameters.
sg: 1.023 (floating hydrometer so pretty inacurate)
temp: 25
Ammonia: less than 0.25
Nitrite: 0
Nitrate: less than 0.5
phosphates: dunno
pH: 8.2
and he doses with calcium 3+ about 1-2 times a week.
Also, jetskisteve he says he isnt a noob and the shrimp hasnt just moulted. but thanks for the advice.