ok, so i have a pond housing two RTC's. leading up to this pnd is a "river" or "stream" it has a lot of rocks in it. the rocks a covered in algae. so im wondering if i could take these rocks and place them in my tank which houses a 16' clownknife and a 12' pleco. will this affect the water in a negative way? will the pleco even be interested in eating the algae off of these rocks? is it ok to introduce this much algae into an extremly clean aquarium? i understand that even if this is doable that the rocks are not a staple food for the pleco 