New tank diatoms and brown algae

[Dashiki]

Hi all,

Just did my second water change. After the first I had a diatom bloom that went away after a couple days. Will this happen after every water change?

Tank specs

30x30x24 (94 gal)

20 gal sump

2 AI Sol blues

Water changes where 20 gallons each

Would running GFO help/eliminate this? Someone said it could be high phosphorous.

I use ro but not di water. Filters have had about 200 gallons through them.

 

[Troylee]

Well they feed off silicates... So your water, sand and possibly rocks is leaching it... It will go away with time man... How long has it been cycling?? Diatoms are a good sign the nitrogen cycle is completing...

 

[Dashiki]

It has been up for two months.

 

[Troylee]

Any live stock??? I would hold off on the water changes until you can get rodi water you might be feeding the problem..

 

[Dashiki]

I meant to add that it bloomed again after the second water change.

 

[Dashiki]

Powder brown tang, coral Beaty and a black and white clownfish.

Along with a couple coral frags

With about 90 lbs of rock