I now have BTA's on rocks as well. The rocks are quite small for the most part. I am looking for $20 for a single BTA on a rock, and an additional $15 for each additional BTA on the rock. Some rocks have 1, 2, 3, 4.... So a rock with 4 BTA's on it will be $65.
Just a note, the picture I took was taken under 10K metal halide lighting, with no actinic supplement in that part of the tank. They have a much greener color under some actinic supplement.
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