60 gallon tank with this light what can I grow?

[three90s&125sump]

If you have algae you have PO4 but the absince of algae does not mean an absince of PO4. There are other contributing factors in the growth of algae. Algae is also a secondary issue with PO4 the primary issue (in hermatic (?)systems) of PO4 is it ability to reduce and even prohibit. calcification.


There is no real need to test for PO4 because if your getting a PO4 reading in your water column it is either too late or an erronious reading. PO4 really likes to be attached to Calcium carbonate (rock, sand and skeletal mass) so much so that it will not be detectable in the water column untill after it has reached it maximum bonding ratio with the calcium carbonate in the system or it is added to the system faster than it can bond to the calcium carbonate. The PO4 does not need to be in the water column to have detrimental effects on calcification, it only needs to be adjacent to the location of the calcification glands (tom told me the scientific name of the calcification gland once but my brain leaks) in the coral or other calcarous organism. How it does this is either absorbtion directly from the water column to the skeletal mass of the organism or by wicking up (due to the homoginization effect or capilary action) to the skeletal mass of the organism through the rock and/or sand in the system.