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Thread: API Master Test Kits
11-17-2012, 12:08 AM #11
The substrate can store toxic chemicals like a sponge - a single 90% water change will do far more than three 50% water changes (first: 10 ppm * 0.5 = 5 ppm; next one: 5 ppm * 0.5 = 2.5 ppm; third one: 2.5 ppm * 0.5 = 1.25 ppm. Now a single 90% is: (10 ppm - 10* 0.9) = 1 ppm. So a 90% W/C gives 1 ppm but THREE 50% W/C give 1.25 ppm!!!!
Note the math. It is tricky for values that aren't 0.5. For example: a 75% W/C is NOT 10 ppm * 0.75 = 7.5 ppm!!! Not correct. It is really 10 ppm - (10 *0.75) = 2.5 ppm left. The 0.5 is a special case that works by simple multi. In a similar fashion, a 25% W/C is 10 ppm - (10 *0.25) = 7.5 ppm left in the tank. Try this method for 0.5 and it still works.Knowledge is fun(damental)
A 75 gal with eight Discus, fake plants, and a lot of wood also with sand substrate. Clean up crew is down to just two Sterba's Corys. Filters: continuous new water flow; canister w/UV, in-tank algae scrubber!! Finally, junked the nitrate removal unit from hell.
For Fishless cycling:http://www.aquaticcommunity.com/aqua...ead.php?t=5640
11-17-2012, 12:14 AM #12
Massive +1 to the previous two posts.
Gas mileage isn't everything OIIIIIIIO
Lack of planning on your part does not constitute an emergency on my part.
Why pretend there are no stupid questions? Actually, There are many stupid questions: "Should I drink this bleach?" Is just one example.
Having said that, Just because it's a stupid question doesn't mean that it shouldn't be asked. It's better to know.
A warm beer is better than a cold beer. Because nothing is better than a cold beer, and a warm beer is better than nothing.
11-17-2012, 01:16 AM #13
what everyone else said
11-17-2012, 01:26 AM #14
0Originally Posted by Cermet
20 gal tall - Helios - HM Betta Male, 1 rasbora het, 2 rummy tetras, 1 glowlight tetra, 1 additional tetra, 1 zebra nerite, 10-15 cherry shrimp, Java Moss and crypto planted tank w/ Driftwood and Spider Wood
11-17-2012, 03:07 AM #15
I vacuumed all my gravel during the first and second 50% changes.
Aha! There lies the problem Cermit! three 50% changes didn't change the reading at all. That was three 50% WCs within three days.
Last edited by Dave Waits; 11-17-2012 at 03:09 AM.
11-17-2012, 03:12 AM #16
0Originally Posted by korith