It can touch the glass, just make sure its secure so it doesn't shift. Its instability you want to be worried about if it shifts and hits the glass then you'll have a problem.
Julsy, the tank has been running for 3 weeksjulsy;3275234; said:you will want to monitor your nitrates, nitrites, amonia, and ph. It takes a bit for the tank to stabilize, also another check on your salinity and temp doesnt hurt.
ph should be 8.0-8.4
nitrates should be below 30ppm (my personal safety level)
nitrites, should be nearly 0
ammonia, should be at 0
since you just filled the tank, let it run a week, check your levels, then again 2 -3 days later, if they are going up, keep checking every 2-3 days till the fall