As above , pm offers please , with or without co2 or pump or spoil or not working , old ,new, rotting in your storeroom or whatever ... pm plz ,will consider.
Can I suggest something here ,... For a start mix you saltwater to the lower end of the hydrometer, and if u buy fish or corals aclimatise them longer and u can actually use the water from LFS or farm and mix your saltwater to same reading the hydrometer gives on the LFS water .
Note the not so good condition wp25 has a problem of not starting after switching off. Need some shaking and knocking and a bit of luck to get it moving , but when it starts moving is will not stop. Some kinda manufActring defect I guess .
Selling a working condition wp25 , all modes are working $30 @ CCK crescent .
Selling coz I bought a rw15 , I also have a not so good condition wp25 which will only work on H mode $15 call or SMS 93866651
Ignore the 20degree , it's all about calibration , calibrate the refractometer with pure distilled water set at 1.000 .
U can get the temperature to 0degree but if the refractometer is not calibrated you'll get false reading.
Running biopllets/GFO is always good. Even when it's only a FOWL tank and fish can take high nitrates, they still will do better in cleaner water.
Especially if u have a very big tank and WC will take a lot of salt and water. Running biopallets/GFO can and will extend the frequency of WC don't u think so?
You can actually calculate using those calculator provided .. Eg
https://services.spservices.sg/elect_audit_frameset.asp
For other calculators u need to input the correct tariffs