stuck!!!

Ok im in the middle of building my 1st rack and im stuck on what size heat tape to use either 4 or 6in ... right now the rack will be holding 16q sterlite tubs and one 41 q .. the 41 with be on the top since thats the only place it fits .. all of the bps in the rack are still juvenile and r all under 15 months old and range from 250g to 650g except for the 41q she's almost 3 and is 1800 grams .. eventually this will b a hatching rack as time goes on n I will b using the 16q tubes .. so should I go 4in and on the top part double it for the 41q or would the 4in be fine all around ? Or should I just get 6in ? .. any advice would be great ...

Thanks everyone

Ive never built a rack but i bought an adult rack that has 4 inch heat tape and it works great.

Some pics of the rack might help.

Yea ill post a pics when I get home .. the shelfs r like 14 in so 4 in would be close to a third witch would be correct right? 6in would b close to half

Here r some pics of the rack ..

http://img.tapatalk.com/d/14/01/24/esyvegus.jpghttp://img.tapatalk.com/d/14/01/24/ysemugu6.jpghttp://img.tapatalk.com/d/14/01/24/y9e9ytup.jpg

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