QUOTE=koll12;17152085]Well I used revive and only a few are opening still I don't know what's going on anymore? I crush off this brown algae stuff and it right back next time I look at it.??? I guess I'm prob just going to lose half my stock[/QUOTE]
koll12, we have all experienced what you are going through and this is beatable. Reefing is like the life we live, we learn from our mistakes as well as our accomplishments. If you give up now, you've allowed reefing to beat you. I was heading out for a morning run, but came back to type this lengthy reply to help you. I say you can save that rock and your tank, so what-ah-say mate, are we going to do this or not? What you have is an abundance of macro ( Nuisance ) algae. You can do this girlfriend.
Here's what I want you to do Laura.
1. Prepare a well aerated 20 % water change with R/O water only. Aerate for 24 hours and match the temp and salinity exactly of your tank before adding it and yes, even matching the PH. You don't want to cause and issue while trying to correct another. Not doing so can possibly shock your system while doing a simple water change. Do another water change in 7 days the exact same way. It won't hurt your system if you do it right, trust me. This and what's written below worked for me many years ago.
2. Turn off your lights for 48 hours.
3. Check to make sure the bulbs are good as old bulbs can sometimes contribute to the algae bloom.
4. Check and double check your nitrates and phosphates with a very good test kit then double check them with a friend or LFS test kits of a different brand. Even slightly elevated levels of Nitrates will cause reduce calcification and can alter PH and Alk levels.
Phosphates can get into your water column via food sources, source water and some additives. Be proactive in making sure these are not a root cause. If feeding with frozen foods, be sure to thaw first in a cup of tank water, then strain/drain off all the water, then add just enough without over feeding to your tank. This liquid is often nutrient rich and you don't want it in your tank. You must use some phosphate removal media. I haven't use it in years so maybe someone can suggest a brand and type.
5. If you have a protein skimmer, then crank it up as it is the most natural and effective means of nutrient export which is what you need right now. If you think about the frothy foam from the ocean, which is nothing more than what your skimmer is doing, is a natural means of nutrient export. So using the skimmer right now is a must I think and empty the cup daily and clean it with warm water and a dedicated tooth brush. The down side is that you will be removing food for your filter feeding inverts, but there is adequate amounts that you won't starve them and your greater concern I think is knocking down the algae.
6. Check your heater, make sure it is set accurately, no higher than 80, I prefer 79 degrees. But for this issue, and according to A. Calfo, if you slowly lower your temp to 77 degrees and raise your PH to 8.5, this also will help control the outbreak. But make these adjustments carefully and slowly and it does work. Once the issue is resolved, slowly return these readings to your normal levels. You aren't going to solve this issue overnight but if you start today, you can slowly turn this around.
7. High silicates can and will also contribute to algae blooms which is why I'm against tap water usage for reef tanks as it is loaded with silicates.
8. Though polyps thrive in nutrient rich water, excessive nutrients is the line that's hard not to cross without remaining proactive. If you have any current mechanical filters, they must be cleaned and rinsed frequently as they will also accumulate nutrient rich gunk which will contribute to your problem. Even skimmers should be cleaned including the collection cups to prevent re-entry of what you have removed already. You can try using poly pads/filters, but again, you have to rinse and keep them clean.
9. A clean up crew is essential my friend. Natural predation via fish and inverts does the work for you 24/7. They will consume uneaten food, control algae and help with detritus buildup and they work for free. Pods, slugs, snails, limpets, chitons, crabs, urchins will all help, but all aren't needed.
10. Current, this is so vital and often over looked. Current feeds and exports waste, detritus, sediment etc. Insufficient current has been shown to contribute to cyano growth in stagnant areas of a reef tank. I even make it a habit once a month to take a power head and blow off my entire reef. Try it, you will be amazed at all the junk that is dislodged. It can then be removed via filters in an overflow or sump filters. I prefer and recommend current which hits most areas of your tank left and right.
11. Carbon is a must, run a high grade granulated activated carbon and only enough based on the size of your tank. It is great in the removal of organics in your system. You can use it in a media bag but be sure to keep the bag cleaned and rinsed. Rinse the bag weekly and discard/replace carbon every 2 or 3 weeks.
13 Choose an algae eating fish, ( a herbivores for the algae) are natural predators and will also help. The most popular are surgeon fish with are natural grazers and will mow the lawn for you like you won't believe. Algae Blennies are also great to have and watch.
14. Using a phosphate removal pad or media will work well also. There's much debate over whether to use Ferric hydroxide based or aluminum oxide based pads or media. You will have to decide which is best or maybe someone else can weigh in since I haven't used it in many years.
15. Manual removal of the algae and scrub with a tooth brush or wired brush.
I hope this helps, now go get'em tiger.
Mucho Reef
PS, 90greefman and Scopus Tang gave some great advice. You now have more than enough info to knock this down. Your mission, should you choose to except it, is to destroy that algae. This message will self destruct in 5, 4, 3, 2, 1, BOOM !!!