how to select and set ?

[clarkmaxwell]

hello:
my new sps tank is 130cm(L)*90cm(W)*60cm(H),I will put tunzes at corner .there are two solutions ,which is better ?
1、6105*3+6205*1
2、6105*2+6205*1+6212*1
thanks！

 

[rvitko]

I think that either option is extreme overkill, 2 6105 or 2 6205 and a wavebox would be all that should be needed.

 

[clarkmaxwell]

Do you think wavebox is indispensable?
what I want to know is what Difference between 6215 and 6212?
thanks

 

[rvitko]

I don't think it is indispensable, it is a useful addition. Waveflow is secondary to more traditional circulation, it gives a nice natural effect, aids detritus removal and helps with polyp extension, but on its own it is not a good source of flow, it is in addition to, not a substitute. 6215 is a bit stronger and basically the "new and improved version". The most recent units include the 7092 controller which is a bit easier to use.