Need help, getting frustrated!

Ok.. Here is the deal.
I have looked through all the other threads and most the google searches I could find, but I am still at a loss. I keep getting either grey slime on the submerged roots or lately black goo (not really slime, not dead plant matter).

Here's the data:
6 site tub, insulated/light proof.
10 gallons, was unfiltered now back to filtered (city water, PuR filter)
Res temp 68-75F
Botanicare Pure Blend (bloom, grow, karma), half dose (actual = 1TB/GAL, i am doing 1/2 TB/GAL) but usually not all at once. With these ladies now in the tub its only half bloom nutes.
Ambient temp= 70's off, 80's (85 tops)
400w HPS
I have added H202 and that failed. I have added and cleaned/sterilized with Physan20 and then used Hygrozyme to rid anything dead, then cleaned again and then h202 treatment. I have seriously tried just about every combo you can then derive from that.
I have even tried doing nothing- no nutes, no h202.
I also use several ice packs if the water seems to be to warm.. Never gets below 65 if for very long.
The only thing I have left is this:
1. Forget it! Rockwool was a known sucess in my situation.
2. Add Dutch Master and see if some BB's will help.
3. Something I may have missed, and will be suggested

Anyways, thanks for taking the time to read/suggest/post. I really have looked around, as far as I can tell it seems to be a bacterial thing- maybe pythium or something but I am not sure.
I love the bubbleponics method- it worked absolute wonders in my veg area but under the HPS it is failing. Thats why I think its a temperature issue and the temps are just right for either bacterial growth or algal growth, but i have never done this so I lack the experience to diagnose and treat/prevent this problem...
The roots look horrible, not growing fast at all. Feel like i keep hitting a wall!

If you've got the cash man invest in a rez chiller. consant rez temps of 68F mean no algae at all and highly oxygenated water too. if you're in the states have a look at a product called the ice probe - i've read in many other posts it's a really good buy. You can't get them where I'm from though and so I ended up spending like 150 bucks on an aquarium chiller off ebay - it has worked wonders for me and is probably one of my best investments.

Also, have you tried using sensizym or cannazym or one of those types of products?

you have any pic of the root with that stuff on it?im having the same problem


this is what im working with

then it turns into this,after adding nutes

concrete351 said:

then it turns into this,after adding nutes

Click to expand...

sorry i didnt respond quicker- thats the exact problem it seems I kept having, except there was always some sort of goo.
There was one thing I had totally missed- I stopped using filtered water! I was filtering our tap water with pur 3 stage and those really seem to do the trick.
I moved them into rockwool because of the damage- they probably wont survive but who knows. Meanwhile I am going to try to get my room temps lowered as i will constantly be fighting physics and heat transfer- water will always reach equilibrium with surrounding temps.
Good luck though! I gave up for now.

i taped my rez with 1/8 insolation tape,and removed 2 23w 2700k bulbs, now my temp is 69in and 77out it helped. just wash the roots with pure h2o2 %3 the roots love it. also i bought some hydrozyme and added that makes the root rot go away and helps the roots

here a pic after i cut the roots down (ill never do that again ill just deal with it) and got eveything managable