Hey Psycho

"i am using foxfarm ocean forest right now with about a 30% perlite mix, mixed in with some 0-7-0 guano."
- Sounds great but I would add a either a small / modest QTY of something organic with high N OR Add a low / modest amount of a Chem fert with High N. I say small / modest cause you already have the 0-7-0 in there. Don't overdo it. Sure you can leave it as is and just rely on th 16-16-16 grains for the N too if you prefer.

"my nute supply is maxsea 16-16-16 granulars but havent used it yet."
- Others may suggest a different canna specific blend but believe me that maxsea 16-16-16 will grow just fine. I like to wait like 1.5 - 2 weeks after they come up and hit 1/2 dose the first time. You'll get a feel after a while just by looking at them.

"what would be a good guideline to building this up and the proper nutes before any specific problems arise".

Just start at 1/2. If nothing burns, wait till the 2nd water from there and then give them a full dose at the rate on the label for indoor use. From there your gonna have to feel it out. It varies depending on soil and strain. Just watch for any leaf burn after you dose em. The more they can take without burn the faster they go. I personally don't like to go with the real small dose every water method although some people do. I like to go like every two or three waterings at a little higher dose.