The 5 gm agar agar powder (1 tsp) is what I used for the flowy cheesecake dessert. For a firm looking dessert, use one whole sachet (10 gm) of powder or 10 gm of agar agar strands.
For strands, soak them in the water for around 30 minutes. Keep it on low flame and stir till the agar agar melts into the water. It may not completely but try to do it as much as you can. Cool slightly before straining the liquid. Add this liquid into the blend mixture and give it a good mix.