I don't know about the cleating agent, so I can't comment on that, but what you adding 10 gal sounds about right, so you could continue with that. I've never done a fishless cycle before, so I can't really comment on how much of a pH swing your have, but that sounds like quite a lot. Hopefully some one else can comment on that, but you did since you did add ammonia hydroxide, it could be normal (hydroxide is the strongest base ion, meaning that it will raise your pH).
I'm running out of battery, so I can't look up more right now, but I'll get back when I can.
Good luck.
I'm running out of battery, so I can't look up more right now, but I'll get back when I can.
Good luck.