When you said you used 11" heat matt on 18" and slightly larger tanks does this mean 1 matt per tank? I was hoping for one large matt for atleast 4-6 tanks arranged thin side out. What was your ratio? I'm assuming the matt was large enough that the whole bottom of the tank was covered, so that you ...

In terms of heating, undertank heating for racks is, in my experience, very efficient and cheaper. It does however mean that each row of tanks will be approx. the same temp., but in a fishroom the lower tanks are always cooler and your Xingu pl*cos all go in the top row. :-) Jools In designing a ...