From my understanding they won't leach. I'm putting my trust in Levi.
The other reason I went woth the tile is I'm sure sps will encrust on them. Giving me a little more room for frags.
Also I like the cleanliness of barebottom but not the look so I hope this is the best of both worlds
The directional bulk heads are to be pointed down to blow directly on the bottom keeping organics suspended.
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