i have heard of people's tanks crashing due to a sand bed expelling toxins. it was with beds that were 5 years old or more. i've never tried a DSB
though, and state this is only hearsay.
i have always been told that the best way to have a DSB
is in a separate tank. something that can be closed off from the DT if necessary.
i have also heard that the filtration benefits are excellent.
i will be implementing one in my next system, but it will be a separate tank from the DT.
i guess we need the folks with 10 year old DSB
's to speak up.
btw- what's in the bed is not what keeps the nassarius snails fed. it's what you put in the tank. they eat meaty foods. uneaten fish food is their main diet IME.