Foaming at filter sock and Fresh Prawn Cycling question

[nicreef]

Hi,

1. i am using filter socks for the first time and noticed a lot of foam today when i reached the office. Replace it to a new filter sock (bigger) but 3 hours later i see foam coming out liao. is this normal?

ps: new tank that is being cycled added in sand on monday.

2. how many prawn should i throw in? used my expired reef nutrition actipods on monday (half bottle) but today ammonia still 0 (salifert) 1 (api) so went to buy market prawn. Aunty say minimum $2 thus i am left with a lot of spares. threw in about 8 prawns liao still have 10+ left. should i throw more (would it be beneficial??) or i throw too much liao haha

ps: tank is 4 x 2 x 1 total water volume around 260. old media i am using from my old tank (that has just recovered from a crash) is some sand that i put in sump, 2 tray of crush corals and 2 filter wool from canister.

[artxakis]

i think the sock is filled with detritus or fine sand floating around

[ASHWIN]

yes this is normal as you added a shrimp...same principle as choped shrimps being washed in a bowl.will have foam..your tank must be small correct?