zt6600 has been used on 1.5m tanks sucessfully in the past they just need to be lifted a liitle higher in order to achieve the spread, the ZT6800 is more suited to the 1.5 to 1.7m in length tank with the same principle of lifting the unit applicable for the 1.7m length.. the ZT6800 is a great deal more so unless you are planning a side to side full on scape the ZT6600 will hit the spot for most!
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