Basically, orchids don't need much fertilizer. As far as calcium goes, it depends on your water. If your water is very pure, then yes, adding it does matter, for any orchid. (New York city water has a reputation for being quite pure) But you certainly don't need to change the regimen during blooming. Cutting spies doesn't conserve energy - the plant can actually "recycle" the tissue of the old spike as long as it's green. If you leave it, you may even get more flowers, or a keiki or both. It's an aesthetic judgement... if you don't like looking at a green spent spike, trim it. If it doesn't bother you, leaving it may even benefit the plant.
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