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I would watch using plastic netting,they contain petroleum byproducts that with the evaporation from the could allow this to drop into your system.
Regular fibreglass window screen will work,or you can buy stainless mesh that won't corrode.
Huge fan of quiet-one pumps.
Internal or external use,low price and I had great luck with them for the past 20+ years.
I run my 150 with 90 gallon sump with 2 4000 pumps.
HTH
I would skip the chromis and add more anthius nyaquatic has a sale on schools of 5.
I woud stick to pygmy angels over dwarfs, and maybe a scribble angel (mine does not bother anything nor does the emperor I got from tripsie)
You have to look at your tank go with what looks good to you.
Yes the mud has life in it but it pack down super tight,you get the snails in there working about and you see lots of bubbles coming from the mud.
These bubbles are basicly toxic from what I experinced,the more the crabs dug around the worse my water quality became I guess they were releasing...
BAd experience here....
I had my first sump mudded up and it crashed bad and I cared for my bed as close to the T as possable.
My sumps now consists of:
50% Agri-alive
25% Agrigate
25% Live mix from the main system,
never a problem with any crashing or system spikes,In my new sump (72x12x15)...
Had the same problem with my AGA 150 mega flow system.
I solved my problem by extending the intake pipe as close to the bottom of my sup as possable,but leaving room to add a pvc T on the bottom of the pipe.
By splitting my intake flow to the 2 corners of the sump it eliminated my micro bubble...
Very active and once they settle in they get a richer blue color to them.
Congrats on a good score and nice lookin rott.Oh hey how'd you attach that chew toy to her back..LOL