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Jim we found that when we had a brook like infection that freshwater dips and putting them in a hospital tank was the best. We then treated for several weeks with erthriomycine (sp?) and that seemed to work. We saved our one clown and wrasse by doing that.
I think running both mp10s at full with your return pump with the koralia you will be fine (you might even be able to drop the koralia). We have used exclusively Fiji Pink in our tanks and are very happy with it, heavy enough not to become a sand storm but light enough it won't trap gunk.
Welcome to the board first off.
Secondly: When Paul says you have a high bioload it comes down to the type of fish you have along with the quantity. Tangs are notorius eaters and poopers as you have observed, especially the blue tang which can reach 16 inches when fully grown (They yellow can...
As far as fish goes start here:
http://www.liveaquaria.com/product/aquarium-fish-supplies.cfm?c=15+2124
Just about every one of those fish would be fine and some in multiples. The only one I would avoid is the catalina just because is needs much cooler temps than a reef and a 10g is tough to...
Can you run a 10g tank with that light and the hob filter? Absolutely, NikkiT did it for years. You just have to be really carefull what you put in the tank and make sure you are religious on a gallon a week water change. She ran is basically as a fish only with inverts. You might be able to...
Take a look an anthias maybe? Many varieties in some amzing colors, not aggressive, reef safe, don't need sand, not prone to jump (yet all fish can jump) and they generally eat smaller pieces of food.
Not even close to a candy, I would try and get him out. We had one that was all green that we suspected of getting a few fish. We had to pull the 45g apart to get him and it was a PIA. Not all pistols are safe.
Do you know what kind of pistol is it or what it looks like?
Pistols can be annoying as all heck to get out as they can hide in the rock or in the sand. We have had to leave rocks in buckets overnight to get them out before.
Depends really on the pump and how much gunk is on it. If we have an algae outbreak or something along those lines maybe once a month. For normal maintenance probably one a quarter.
If it is just some algae and gunk then vinegar will work just fine. If it is really stubborn then you can look at magic clean from hydor or muriatic. I find with Vortechs that vinegar is just fine and you probably don't want to go too much more than that.