mar·i·nate /ˈmerəˌneɪt/ verb
mar·i·nates; mar·i·nat·ed; mar·i·nat·ing
: to put meat or fish in a sauce for a period of time to add flavor or to make the meat or fish more tender : to soak in a marinade [+ obj]
▪ The recipe says that you should marinate the chicken overnight. [no obj]
▪ The chicken should be allowed to marinate overnight.
▪ I wouldn't marinate that in peroxide if I were you.
If the algae infestation is severe, cut your losses and trim heavily. Plants and weeds all grow so you'll eventually get it all back