2 questions

[marinelife]

1.Is strong light enough to keep bryopsis algae growing, the reason for asking is ever since I upgraded my lights 3years ago I have gotten this algae and it will not go away
my tests are as follows
PH 8.15
CA 475ppm/425ppm with Sr test
KH 13.8dKH or 4.91 meq/L
Mg 1260ppm
Sr 10 mg/l
Si 0ppm
PO4 0.0-.03ppm
Nitrate .1ppm
Ammonia 0ppm
Temp 81
sg 1.025

This is a 180 gallon Reef with SPS and 3 Clams, I have 2 100 gallon sumps fill of live rock, a 75 gallon sump with Chaetomorpha, and a 20 gallon sump with carbon, ROWAPHOS, and Purigen. I have a CA Reactor, Chiller also connected to the tank. The main tank have 2 400w 6500kmh with a 400w 20000kmh in the middle, I also have 2 160 w VHO actinics. The sump are on lights that are on about 16hours at night. The MH on the main tank are on 10 hours a day. I dose DTs twics a week with Mg once a month, I use ro/di water for everything. I have two tunze stream 6100 pumps alternating in the tank plus the return of 1200gph. I have tangs and lettuce nudibranch but they do not eat it. The algae it not bad and does not grow fast but I would like to see it gone.

2. Also RTN happens in my aquarium and it kills off part of a coral then moved on to the next coral. I have only lost two corals and the others recover and grow but them start to loss branches again. I can not figure this one out either.
Any Ideas for either????

 

[Fatal Morgana]

>1.Is strong light enough to keep bryopsis algae growing, ...?

Well, being a plant, it will keep growing until it was removed, eaten, or get sexual.

 

[Ben1]

Or the nutrient was to low for it to grow any further.

Why all the LR in the sumps, 2 100 gal sumps filled with live rock is probably your problem IMO. If they are connected to the system and water flows through all the rock, it seems to me it would just become a nutrient sink/detritus trap. The LR in your main tank should be plenty.

I had byropsis a few years ago and when the nutrient was very low and I kept up with manual picking it disappeared and wqas over taken by coralline.

Also RTN happens in my aquarium and it kills off part of a coral then moved on to the next coral. I have only lost two corals and the others recover and grow but them start to loss branches again. I can not figure this one out either.
Any Ideas for either????

A lot of people complain about this when first using Rowa, I think the conclusion is the RTN starts becuase the nutrients in the tank drop so dramatically and the SPS dont like sudden changes.
How long has the ROWA been in use?

 

[Fatal Morgana]

>...I had byropsis a few years ago and when the nutrient was very low and I kept up with manual picking it disappeared and wqas over taken by coralline.

Same experience here.