I'd do your lessons/food. The fish can survive till the next time you accumulate that some odd dollars for the plants :) Food is def. more important, and riding makes you happy and can get you out of the house :) :).
My short rant- I thought I'd be done with my flower project by now, but I am done for tonight! Ugh.. I would say I am 3/4ths of the way done though..
1 Doberman Mix: Emmy, 2 DSH Cats: Rowan & Jacob, 1 Bearded Dragon: Rainier (aka Mista Lizad Man), 1 Eastern Box Turtle: Greta, Two 5g tanks: Alchemy (Halfmoon) and Custard (Yellow VT)