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 fifteen Sterba's Corys. Filters: canister w/UV, in-tank algae scrubber that removes phosphates and nitrates! Also, a highly dangerous commercial nitrate removal unit from hell
For Stocking Questions see: http://aqadvisor.com/AqAdvisor.php?
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.
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11-17-2012, 01:16 AM #13
what everyone else said
11-17-2012, 01:26 AM #14Originally Posted by Cermet6 gal column- 1 powder blue dwarf gourami, 1 bronze cory, and one nerite snail, planted.
10 gal - 2 F celebus rainbows, 3 ghost shrimp, 1 nerite snail, 1 mystery snail, planted
10 gal #2 - 6 flame tetras, 1 ornate tetra, 1 nerite snail, and 1 emperor tetra planted
Cinnamon = 9 year old Siamese Cat
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 #16Originally Posted by korith