Eternal Isles 18-1 have too few bubbles?

Bubble Witch Saga Eternal Isles 18, Level 1

Eternal Isles bubble Witch Saga 18-1Starting Bubbles: 30
Recommended Potions: + 7 extra bubbles, + 3 holes in the ceiling, the RB Bubble
Points needed for 1, 2, 3 Star: 90 000, 115 000, 140 000
Special bubbles:
yellow-spider-bubble Spider Bubbles
black bubble-is-hard-as-rock Black Bubbles

The main problem with 18-1 is that you run out of bubbles all the time. Therefor it is important to aim high. Don’t take out any low bubbles unless you really need to. One single unnecessary shot for a bubble located low can make you ending up the level with no star. So ALWAYS when you have an option to burst two different clusters or bubble pairs, choose the Upper cluster, even if it has Spider Bubbles.