my DIY sump

[big_ben102000]

i used to have a FOWLR tank, until recently i got some corals from some friends and cousins. while some survive some didnt, i got a salifert nitrate test kit and found out my nitrate level is 0.5. thats is high rite ? it shouldnt go any higher than 0.1 ? then how am i suppose to measure anything lower ? i dont really understand what they say about dividing by 10 to get a more sensitive reading. can anyone here explain it to me ? thanks

my ammonia level is undetectable

below is the design of my sump. i didnt want to make anything permanent incase i need to do any modifications in the future and i dont have the keching as well

any comments are welcome. sorry about the poor quality pic. it become like that after i change the format of the file...

thanks

cheers*

[big_ben102000]

sorry the size of the pic .. dont really knoe how to resize