Greetings JACKMAYOFFER
Canna Aqua is fine...given adequate ventilation, air circulation and light intensity (I believe you've got these aspects covered) any reputable line of base nutrients will suffice.
Contrary to manufacturer's claims: Canna Boost is not optimally suitable for active hydroponic applications. An under-recognized and hence little-discussed issue is over-colonization. The appropriate checks and balances to properly manage a 'micro-herd' does not readily exist in an active hydroponic culture. Moreover, it is simply: unnecessary.
PK 13:14 does not replace
Advanced Nutrients'
Big Bud.
Big Bud should be used weeks two, three and four (2-4) during the standard flowering cycle of eight (8) weeks. In a longer flowering strain (say ten (10) weeks) usage should occur starting in week three (3) and extending to week six (6) (that's four (4) weeks of application).
Follow this period with a two day flush which primes the plant for Potassium uptake (Potassium is actually more important than Phosphorus when discussing overall yield in Cannabis); then use your bloom booster of choice. Canna's PK 13:14 is recommended, but Advanced Nutrient's Hammerhead is even more so because its PK profile of 9:18 (1:2) is research verified as optimal.
Use either product for twelve (12) days. 'Yellowing' should occur, but it should be monitored. Alternating foliar applications of Epsom salts (Magnesium Sulphate), Fulvic Acid (every cultivator should be using fulvic acid as a foliar....period) and if necessary, 5:1:1 Fish emulsion, should be employed to retard excessive 'yellowing'.
Follow up with Advanced Overdrive until flush.
Sincerely,
Charles.