by RTR on Tue Mar 20, 2007 10:30 am
For quite a few years, phosphate limitation was a mantra of plant-keeping, but that has been disproven and went away several years back. Phosphate is a macronutrient (NPK - nitrogen, phosphate, potassium), so if it is not present, you can have algae issues.
Planted tank folk tend to need and to do routine supplements of all the macros plus carbon plus all the traces (micronutrients rather than the marcos plus carbon), but they also tend to run high-light tanks. Under such supplement handling, nitrogen is generally about 7-10x phosphorus and potassium about the same as nitrogen or a bit higher. That would give an NPK ratio of about 10:1:10, but on those figures there is a good bit of wiggle room. At your level of upper moderate lighting, bioavailable carbon is the most likely need - NPK if anything will be in excess in a puffer tank but handled by water changes. The traces are less likley to need supplement - even light BW has a lot of other-than-NPK minerals.
Where's the fish? - Neptune