It probably is blue-green algae but it is only a problem under the 2 new tubes, not the whole tank. I can remove the plants to treat them as they are just bunched and weighted ready to take north.
Where do I get erythromicin from? Does it have a brand name of some sort I should look for?
Thanks for the advice.
Poor water quality wouldn't surprise me either, you know I rarely do water changes and with my back problems recently......