Upgrade time !

[gregzz4]

Originally Posted by Craigdillman

Any ideas

i had an idea a couple days ago, but forgot to post it ...

You're dealing with a new sand-sifting fish who is stirring up all these PO4 and NO3 readings ...
What if you were to remove the top layer of your sand ? Isn't this where the readings are coming from due to your new sifter fish ?
Siphon out 1/2 to 3/4 of your top layer, but leave a bit for the new fish to 'feed on' ?
I don't mean to remove 1/2 - 3/4 deep, but rather remove the top layer of 1/2 to 3/4 of your whole tank's footprint.
Replace the top layer with new sand and the new dude can live off the part you haven't removed.

Then, in a week or two, you can remove the rest and replace it again with new sand.

Just a thought ...