Deep sand bed

[naesco]

Originally Posted by frd72

thanks a lot!! that's why i decided to ask it here first before doing some changes on my sump. so far i don't really have a big issue (bad) with my tank when it comes to water parameters..

thanks,
teddy

You defineately will have.
You have four fast growing tangs in a 75 gallon tank.
You should plan now to set up a minimum six foot tank. I don't think that anyone will disagree with this advice.