slow - zero coral growth

[Der_Iron_Chef]

I think it's always a shot in the dark, when you're hazarding a guess as to why two different tanks with seemingly similar statistics, experience such different growth rates.

My tank has never been really stable, for example. I don't have an auto top-off, and my water changes were sporadically regular. I dosed for Ca & dKH, except when I didn't...etc, etc. But I experienced some pretty crazy growth in some corals (some of those SPS). Others, like my purple mushrooms, which by all accounts should be spreading like wildfire, split at a snail's pace.

Having said that....what is your bioload like? Livestock? Do you test regularly?

[saltyrockbox]

75g tank bioload 3 small clowns, small 6 line, small foxfaced rabbit fish, I feed a 1/2 cube of frozen whatever I have or a pinch of flake every day, lots of zebra and blue hermits one starfish and one coralbanded shrimp,
I tested nutrients for a long time and for about 3-4 months was getting zero, I have been dosing Ca & dKH by hand after testing a couple times a week I have auto top off and with the new lights and fans go through A LOT of fresh RO water. My RO system is crapy nano systme i got a while back I have not tested its performance, maybe I should do that.

[saltyrockbox]

I guess there are a lot of little things I can work on. I have a little red mushroom that finally split I thought it was going to die but also have some big furry mushroom that have never ever grown, lots of colt frags that grew for a bit then never grew again...I got a hammer that grew a lot for 3 weeks then stopped.
DO you think the slime alage can inhibit growth?
DO you think I need to add any supplements? a lot of people dont and have good results with regular water changes as the only "additive" I use IO salt

[fishoholic]

I found my corals grew a lot more when I switched from T5's to MH.