Giving additional floor support for 150 g tank

George Patterson wrote:

Place it under
the first joist out from the wall; that's the only one actually under
the tank.

Second thought. You will probably have that tank on a stand which will place it
away from the wall some. Assuming standard spacing, the second joist will be
about 32" away from the wall, and this will be close to or under the corner of
the stand. If this is your situation, place the jack under the second joist.

George Patterson
We don't stop playing because we grow old. We grow old because we stop
playing.