Questions - Need some input

Hey guys,

I had a few questions about the proper way to resilicone an old tank. I have a new to me 75 gallon tank which made it into a few pictures on here previously (link). The silicone between the glass panels is fine. However, the silicone around the internal portion of the tank has gotten beat up and scraped into by its former owner. As such I am uncomfortable with using the tank before I attempt to fix the silicone. However, I want to do this correctly and have a few questions. ...

I have a few questions about compression foam used underneath larger tanks.

1. How thick is the foam you usually put under your tanks?
2. What type of foam do you usually use?
3. The neoprene foam on this website seems like a good choice. What do you guys think?

My tank is a 21" tall tank (It's a standard sized 75 gallon). Assuming that the pressure ratings found at the link above is rated in psig (gage pressure) and not psia (absolute pressure), then the additional pressure due to a 21" ...

I have been looking pretty heavily at making my own lighting for a new 75 gallon tank I just got. I'm debating whether to make an LED fixture or use MH lamps. I am wondering what the light output need would be for a standard sized 75 gallon (I realize LED and MH are different so whichever you guys know more about, please fill me in!). I would like to ensure that I can care for SPS corals adequately (the tank is 21" deep). Also, I am planning on hanging them 6 - 8 inches above the tank if ...

I'm posting this from my iPhone since it's the only Internet I get at home so I don't have pictures. My problem is that a week ago I drilled into my Biocube 14 thinking it was acrylic... To make a long story short it wasn't. I reacted too quickly and placed my fish in a 40 gal breeder tank I had turned into a sump (it had been water tested previously, but the first time it had had saltwater in it was only several hours before). It was completely new and I tried to place all my livestock and coral ...