What test should i use? THESIS HELP!!


I am currently studying Zoology at university. I am currently in my final year conducting my dissertation. I have completed my data collection and I am now on to my statistics.
My dissertation looks at the relationship between light intensity and growth rate in marine sponges. I have 5 species of sponges and this was conducted over 7 weeks. I have 3 replicates of each species and once a week the area of the sponge was calculated. There were two light intensities; Light and Ambient. I was thinking is a 2-way ANOVA acceptable or should another test be used? I want to see if there is a significant difference between both light intensities, between species within the same intensity and between species within the different intensities

I hope that makes sense!