That is a BAD idea. If you do that, you will end up with dead fish, an
algae swamp, or possibly both.

Are you sure?

Several people have reported good results using the regular Jobe's, for
beautiful houseplants. They are 13-4-5. The Miracle Gro spikes are 6-12-6.
Lower in nitrogen, higher in phosphate.

I think it might be okay, as long as the spike is deeply buried in the
substrate. Personally, I find nitrate to be more a problem than phosphate. My
tapwater has tons of phosphate in it, so I don't really need to add phosphate,
but it doesn't seem to hurt anything. Fish don't seem bothered by it, and it
doesn't cause algae problems.

The liquid Miracle Gro should definitely be avoided, since it's added directly
to the water, but spikes... I think they might be worth a try. Just bury them
deeply, and do not disturb the area for a month or more.


Leigh

http://www.fortunecity.com/lavender/halloween/881/