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[APD] grey slime

I have gone through the archives to find out all that I can, and it seems to have been discussed before, but no real information was given, except that some folks had to deal with it. It gets worse each day and I am not sure if it is fungal, bacterial, or an algae. It grows really fast and I have removed it twice last week and then again twice today by siphoning with airline tubing, and it comes right back. 
Some tank specs...
75 gallon, open top, planted, Flourite/Onyx sand substrate, heavily planted, 2 175 watt mh @ 10 hours per day (alternating w/ up to 3 hour overlap), pressurized CO2 @ 30 ppm, 6.6 PH, 4dKH, and a GH of 3.
Three 2year old angelfish, 9 glowlight tetras, and four Apistos live here amongst the plants and are fed very lightly. I do weekly 50% water changes and this past tuesday I changed from PMDD to Tom Barr's dosing method. Tuesday I did a 50% water change and dosed a bit high on K2SO4, KNO3, and very high on Plantex CSM. Then Wendsday when I got all my ducks in a row, I did a 65% water change and dosed the recomended quantity. Since my tap water contains 1.6ppm PO4, I did not dose PO4 until after three days when my inexpensive PO4 test read 0. At which point I dosed .5 ml from a fleet enema.
My plants have responded beautifully, but I fear I am doing something wrong, given the webs of slime I have.
Please help me... The slime has started to stick to one of my angelfish's ventral fins, but he doesn't seem affected, or even to know for that matter.
Thank you,

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