Not sure if you mean that the Cattleya is just out of a flask, is a year out of flask or if you have had it a year....
I have gotten many tiny Cattleya seedlings but since I use red lava rock/LECA and basket pots, I often will water them daily in the summer and every other day in the winter. I plant them, roots and all, on top of the medium and just weigh down a few roots with rock. That way, I don't damage the roots and they continue to grow (and grow down into the rock). This is for the very tiny, fragile seedlings. Older seedlings have much longer roots and these seedlings can be treated as a mature Cattleya.
With Cattleyas, I find it very important to give them an extra calcium source. So, when potting them up, I mix in eggshells and, after, add eggshells every couple of months.
Fertilizing? I fertilize all my Cattleyas the same but with the really small seedlings, I flush the pot more often so as not to damage delicate roots.
I hope this helps. For many years, I only bought seedling Cattleyas, many of them seven years to blooming (at least in perfect conditions...it took me ten years to bloom one of them). I still buy seedlings as many are just not available or are outrageously expensive for the blooming size option. Seedlings are also very rewarding to grow. Good luck!
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