HappyGeorge
Fish Herder
Gravel cleaner works great, that's what I used to add under my rocks, no spills onto rock at all and settles straight away.
and now.. my first batch of 100L of salt water is being mixed! NEver thought I'd get so excited over mixing up salt and water!!
Its the best part setting it up just go slowly once all setup
I would invest in a pot of speed glue to scape a bit messy but is better than millie putty