I got my paws on a 250 gallon tank, it needs some work but thats ok I'm going to need some advice as i go along. It is missing a piece of trim but it looks like it does nothing but look pretty or it did at one time. On a tank of this size does the trim do anything for the structure or is it held together just by the silicone? Is there a silicon that is made for these larger tanks or is it the same as what I have been using on my smaller tanks for years? The sand bed and filtration we are going with fowlr on this one my wife wants a humahuma and some larger angels than what we have in our 55g. How should I set that up or should it be on the same principal as my reef tanks? I have a lot of work to do I will post pics when I start the project it's foing to take some time I will have to do this as I can pay for it I know this is going to be expensive but I'm ready to do this.