calculate gallons?

[segraves1]

#ed_op#DIV#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0in 0in 0pt"#ed_cl#hypothetical tank............#ed_op#?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /#ed_cl##ed_op#o:p#ed_cl##ed_op#/o:p#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0in 0in 0pt"#ed_cl##ed_op#SPAN style="mso-spacerun: yes"#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0in 0in 0pt"#ed_cl##ed_op#SPAN style="mso-spacerun: yes"#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0in 0in 0pt"#ed_cl##ed_op#SPAN style="mso-spacerun: yes"#ed_cl#lets say you have a 100 gal tank......you put enough rock and sand inso that you have 50 gals of water (50gals of "space" is taken up by the rock and sand)........#ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0in 0in 0pt"#ed_cl##ed_op#SPAN style="mso-spacerun: yes"#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0in 0in 0pt"#ed_cl##ed_op#SPAN style="mso-spacerun: yes"#ed_cl#when you to figure your filtration/lighting/etc. needs, is this still a "100 gal tank" or is it"50 gals"?#ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#/DIV#ed_cl#

[tigersax7]

#ed_op#DIV#ed_cl#go with the actual tank size (100 gallons) to calculate the filtration, if you calculate for the displacement of the LR and LS you runthe risk of not having adiquite water flow/skimming/filtration. Hope this helps#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#tigersax7#ed_op#/DIV#ed_cl#