Geez, you're practically my part time job.

I doubt the algae is having a serious affect on the ph.

As long as the pebbles don't shift and disturb your root systems it's all good.

Yeah, I don't mind offering a few suggestions. Pics would definably help with the diagnosis.

Keep at it, just think of that sweet, sweet bud you will be smoking a few weeks from now.

__________________
"I smoke two joints before I smoke two joints then I smoke two more!"