I was trying to adjust heater since the tank seems to heat up a lot last couple of weeks, should have left it because it was ok but I do notice it bleaching, not sure where it is from, all parameters ok with the rise of ca at 430, am I overdosing something, or not enough of the iodide.
That top you have is probably keeping the tank a little warmer now, better for keeping your humidity down too. It was running a bit warm. Wasn't your tank running around 86+? I understand why you messed with the heater, I would have too. With that top, you lost your evaporative cooling.
I wouldn't add too much iodine. Be careful, easy to OD.
Do you know what the KH level of your tank was when big blue went south? What was the flow like? Power heads full of algae, or algae growing around/under it's skirt slowing down the flow? From the pic, seems odd it would turn from infection. Color/shape looked good. Hmm. I don't know.
At what temperature do you guys keep your tanks? I have been keeping mine at about 82.5 and my 2 gigs seems to like it.
82.5 looks fine to me. What really matters is, how do your inhabitants like it? If they look happy, keep doing what you're doing.
My 75 tank (6 gigs)temp ranges from (lately) 81 early morning no lights, to 84.5 with lights in the evening. They look happiest 82-83-84 to me. This could just be because after the lights are on so long, they look at their best, and the temp just happens to go up towards the end of the light cycle, while it's heating from the lights. They may actually not care about the warm water, they sure do like the light though.
My 210 (1 gig)temp has gone down (as low as 76) early morning, typically 77, but temp usually recovers to 78-80 by evening. Summer has gone as high as 84? Mertens doesn't like the warmer temps as much, the gig seems to put up with cooler water so far just fine.