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about a quarter of my 75 gallon tank has red algae on the c.c. should i remove it and replace with new c.c. if left alone will it harm anything on the reef thanks

I am confused on the specific gravity that is ideal for a reef tank. The pet store said 1.019 so parasites would not be a problem. So that is what i had it at and my corals looked bad then i let some water evaporate the gravity went up to 1.024 and my corals look great. What is the ideal gravity.

my 75gallon reef tank is about 8 months old it started as fo then fowlr now im starting to add corals as i reseach the corals i see lps or sps what are the abb. for

I was using tap water for my reef aquarium then I was told ro water would be much better i went to wal-marts and i did not see it. I bought spring water that said it was processed by: charcoal filtered, micron filtered, ozonated. I don't know if this is good or not?

just got into saltwater aquariums i set up a 75 gal. about 5 months ago i have some mushroom corals a yellow tang ,coral beauty ,clown, live rock and some inverts. all the test at the lfs check good for water quality but their is a brown film ontop of the water can anyone give me some advice. thanks