I’ve always had 10 gallon tanks usually in my boys bedroom or mine but I was giving a 75 gallon tank and it was in rough condition I scraped off all the old silicone and put new on hundred percent silicone no additives for mildew preventative or anything like that it doesn’t look the prettiest but it it looks pretty good for my first time but there’s one little spot I’m worried about I let it dry for days before I filled it up halfway. What do you guys think ??